As a teenager in the 70s, I spent many an hour poking around in malfunctioning cassette players, mostly to little avail. That video was an absolute joy, more like that please DGW.
Vintage soviet devices are ALLWAYS interesting! This seems to be built quite well, I would have never expected to see a brush-less motor in this, they really went to town when designing it.
Built well but dont survive too long, they always have similar failure points and the motors in them are notoriously trash. They built complex things just to make your job worse when fixing it, lets not forget that they mocked themselves. In the Radio magazine that was published in the USSR they constantly published articles on how to fix your electronics, common failures and even sometimes mocked the soviet industry.
You could make polls on your community tab asking for viewer preferences regarding modern or vintage technology, etc. I personally really enjoy your videos about repairs, experiments and DIY stuff. I feel like there's more to learn from them than the USB charger videos, which are all kind of the same.
Well said. I agree, the wealth of knowledge is amazing. Older equipment often has really interesting engineering instead of just a microcontroller doing everything.
AC erase wasnt that rare in the 70s, national RQ421 for example, pretty standard shoebox recorder has it. Brushles motor is a rarity on tape recorders at this era, away from DD decks and the late generation of Sony walkman which used bldc motors to improve battery life and lower the noise induced by the motor. More like a tiny cdrom spindle thing.
Permanent magnet erase is kind of more modern. A cost cutting measure found in cheap boomboxes and recorders from the mid 80s through the early 2000s and the few still left today. It wasn't really common before. Maybe for dictation machines or something.
LOL, it is a pretty elaborated unit indeed. If you have a look at the 90s units you will be suprised how simplified (cheap) they got. OF course, they didnt lasted long and the sound was awful.
Beautiful video, Dany K 📼 Me as kid in the 80s had a cassette-radioplayer, it was of the brand Audiosonic. Was very nice to record music into cassette and then play it on my Sony Walkman. The memories of the past, thanks for reminiscing it 🔴
Thank you for taking the time to fix it. I think fixing every piece of electronics has its own charms. I think you should do more of these old devices because they are designed to be repaired and last a long time. New ones are just designed to be replaced.
"In Babynon, on a clay tablet, was written "now the world with this younger man is so awful that in a matter of years, the world will go to hell' and here we are over 2000vyears later and the world is still here" - Georgy Mikhaylovich Grechko
You cna have a look at the UHER REPORT 4000 series which uses AC motor and three phase generation. The signal is generated by a conmutator, not by pick up coils. Driver circuit should be smiliar (?)
the mid point of coils ABC is connected to supply. ABC ends are on the collector of 3 power transistors towards ground. the power transistor base is driven by pnp pre-amplifier with a capacitor (low pass filter) and a diode (half wave rectifier) on its own base. The ac (rectified by the diode) is generated by the pick-up coils on the motor. the rotor shaft couples and de-couples the pick-up coils to the magnetizing coil. the magnetizing coil is driven by a push-pull oscillator. TL;DR the rotor determines the magnetic coupling that powers and drives the power transistors
Google for strings "бдс-0,2", "бдс-0,2м" and "бдс-0,14". These are the known varieties of these pure slavic motors. Also google for model names "весна" in conjunction with the word " схема", that means schematic. The problem is a full motor description is not available for the 0,14W model, so you have to find and read one for the former two models. Also seek for the related Russian IC named к157ха3".
I was in high school in 1988. That thing was made at an exciting time ;). Hard to believe it has a DC brushless motor, but that might be a reason it was expensive. Perhaps most surprising is that the belts are still good; there are likely no "western" cassette drives or turntables from that era or even later that still have working belts. I like both the old and news devices; I'm interested in whatever you want to investigate.
I've seen plenty of tape machines with "good enough" belts, some were from the EARLY 70s and didn't seem to have been replaced. It boils down to how much it was used and sheer luck with the rubber composition, rather than the place of manufacture. 90s belt seem to be the worst though I would say.
Have a Sanyo machine of that vintage which still works, also an early walkman (fancy one with auto reverse) that is fine. On the other hand a TEAC home hifi cassette deck, the belts perished a few years ago.
Awesome vid as always 👍 Please show more vintage devices, whether you are repairing them or just explaining how they work. It's always so cool to see how things were built back in the day. My favorite vintage repair from you was the Junost 603. After watching you repair that one, I just knew I had to have one, so I picked one up from eBay :D After replacing all the bad caps and one failed resistor it's now working again and sitting on my desk right besides me 😊
Hello, I really appreciate the videos about older technology. I feel like these is a lot more to learn, and the video is more interesting to watch when the old-school analog circutry can be explained, rather than it being one chip doing everything. A good example was the Soviet TV series, my personal favorite of your videos, you've taught us a lot about how it worked and that made the videos really fascinating. Thanks for reading and take care.
23:47 the motor driver is so interesting, i can recognize on the right a speed feedback and i believe that the winding on the left (the one on the adjustable plate) are determining just wich transistor switch on for the 3 phases so a sort of position feedback, seems to me that the speed feedback circuit is changing a bias for the position feedback and probably it result in a current regulation of the motor... Just crazy, so complex and jet simple, if we think that today we use encoder and microcontroller to drive 3 phase motor, i believe no one today would think to an analog way to drive this kind of motor. I love those things and i love your video Mr. Diode, keep going like this!
3 phase brushless motors are usually monitored via winding feeback or a hall sensor, which both require more processing, and cannot be achieved at all or in a cost efficient way via analog. A Encoder would be way more expensive and I have yet to see a brushless motor that uses encoder monitoring in anything i bought in the last 20 years.
Having been a cassette deck enthusiast since the early 1980s, and just finished restoring a Nakamichi deck from 1980, I can see that this is much simpler than what I'm used to. Never seen a Russian deck before. That motor drive sure is over the top for a machine like that!
What a beautifully made device. I enjoy watching these videos of the older stuff, particularly the Soviet items, they seem so well made; no built in obsolescence.
Finally ❤ this video came!! and I'm happy that it's a long video but definitely not a "Bloody Long" video 😁 and I enjoy your super informative videos more than any movies 🎉 -- love and support from India 😇
Thank you for your support ;). A small soviet oscilloscope is on my list, and some Czechoslovak things (the BM368 hf generator, the BM566A 120MHz scope and the DS-35 stopwatch).
The problem is people are very ingenious when it comes to defeating safety. Like using .22 bullets for fuses, or wrapping the old fuse in aluminum foil.
Thank you for the interesting showcase + repair! Love to see more of this kind, build quality and repairability is so much different to today's mostly throw-away devices. At its time this recorder was probably really expensive. But that also encouraged its buyers to take good care of it so it could last as long as possible. I honestly can't imagine today's tech in such a condition in 40 years, especially regarding repairs... If some flash memory in one of the many microcontrollers deteriorated by even losing one byte, nothing will work any more and it will be probably impossible to repair. Even when replacing the microcontroller there won't be any way to restore its flash memory...
I used to add 108KHz bias on recorders I made and they worked excellently. Those were the days. Next server power supply please and more of such vintage products. Your channel should cross 1M subs soon.
Двигатель именно такого типа использовался в этом магнитофоне для того чтобы снизить шумы по цепи питания в аналоговый тракт, а так же значительно повысить ресурс в целом ведь такие моторы по сути не обслуживаемые и могут много лет работать. Они более надежные чем коллекторные. Ну и такой мотор потребляет меньше тока, ведь планировалось возможность использовать батарейки.
I Have worked on tape recorder for years as a hobby. Never seen this kind of motor in a consumer grade device. The only recorder I remeber using AC and three phase inverter was the UHER REPORT 4000 series. This was done to take the motor noise generated by conmutators and mechanical gobernors out of the circuit. The mechanism has two flywheel, the second one was added as a back check flywheel to improve stability. Not a close loop thing (it would be crazy to find it on a consumer recorder). The olva speaker and some of the internal connections is Grundi-sh. And the 309 number remind me more like Philips used to mark their recorder in the late 70 and early 80s. Also DIN sockets and some Euro symbols. Looks like pure quaility to me.
The first digit in number of soviet devices means the class of equipment. 0- highest class (the best devices), 1, 2, 3 - first, second and third class. Third class is the lowest.
Some of the more high tech Sony decks from around 1980 also had this set up (brushless motor with belt). I don't know if it's really better, a standard DC motor with the 1" mount might fail more often but it is very easily replaced, even now. This one lasts longer but when it's done, that's a real problem. Also is the W&F any better, as the belt is still present? And yes, this thing reminds me of Grundig units from the late 70s, with all the connectors, everything neat and tidy almost like mil-spec units.
@@westelaudio943 You are righ. I dont think that they would have done any better than FG Servo. Probably they want to avoid potential noise from the motor and keep tight control of the speed without worrying about wear. Because the DC Servo ones, are ok, but suffer a bit of drift on temperature and as the age, the speed control turn a bit unstable, because the internal resistance goes high. But even medium level deck have made out with this DC servo motors, the are long lasting. Sony like the FG Servo approach, but I saw 2 o 3 speed circuit on Sony Service Manuals and CANT figure out how they "lock" the motor. Seems pretty basic circuit, I would expect a PLL or someting more elaborated around the FG feedback. Like they are not taking fully advantege of it.
@@38911bytefree The Matsushita FG servos seem to be rather unreliable though, they become noisy (mechanically) and sometimes the internal IC (with the Hall sensor) even fails, often intermittently. When it fails though, it's not a problem at all. Just get a Mabuchi in there and if nothing else you can still get a cheap modern clone, even those work seem to work alright, for how long I don't know. I like standardized parts! I thought about decks like the TC-K65 from Sony. No Idea how the capstan belt motor's controller works, but it's brushless and looks like this one. The whole deck is cool with interesting features but it is a "mechanical nightmare" with random wires going everywhere. I just opened it up one day and thought "nope" LOL.
@@westelaudio943 Yer, I think the 55 II also uses the same apporach. Grundig have a weird capastan motor in one of its 80 decks. I cant remember the model. But I have a JVC TD-W662 and the DD motor ... the chip is from a 5 1/4 floppy spindle . Probably in at early 80s with floppy drives being DD and VCRs ... they started to move this into the cassette. The sonys FG servo I saw (3 decks) the has a signal wire and the power wires. The signal was feed to a circuit. The sinal is passively generated by small geared flywheel that moves on a winding. Pretty small really. It is fitted below the top bearing. Yes, they can be noisiy and the brusheds go out quilcky too. Mabuchi and Matsushita are both EXCELENT. No content. Sankyo also made pretty good stuff. I have a Sharp from 87, still in it original Sankyo motor, that is Sharp Branded. Speed never need to be adjusted.
great video. This vintage stuff is very interesting. And there's not a lot of content related to the soviet stuff in youtube. keep these weird eastern devices coming up!.
Ďakujem ti za toto veľmi pekné video, dobrá práca s opravou kazeťáku, uvítal by som viac takýchto videí so staršou technikou, najmä tie digitrónové stopky a ten elektrónkový VF generátor vyzerajú veľmi zaujímavo. A ešte k tomu kazeťáku, musím uznať že je celkom kvalitne vyhotovený, vf mazanie a predmagnetizácia, elektronicky riadený motor (bezkartáčový), prepínanie typu pásky, počítadlo, indikátor vybudenia, to všetko sú prvky magneťákov vyššej kvality, než bola bežná povedzme v 90. rokoch. Budem sa tešiť na ďalšie videá, najmä s tými prístrojmi na konci videa (ako som spomínal na začiatku komentára), ktoré vyzerajú luxusne.
As a russian, I'm impressed you read the writing, decoding every message you can. Like, someone could've just ignored and go with it. I appreciate the attitude and effort you take in making these videos.
The ussr did have some interesting stuff. For example it was common to have ungrounded low voltage distrubution (both 127 and 220 V) so you could only get shocked if you touched both wires. 230 V IT grid can be found in Norway too.
Hi Danyk. How did you remove the belt wheel from the axle of the motor? Is it press fit? Do you have mini removing press dedicated for that? Or maybe there is little grub screw at the side of belt wheel? Thank you for all your videos :-)
BLDC motor? Well, that was unexpected. Not in a low-end recorder like this... I'd sooner see one in a turntable or a hi-fi R2R / cassette deck. The boards are pretty nice too. And the transistor is... Dodgyyyyyyy! I routinely replace these old Soviet electrolytics. Far more often than not they gave me trouble, most notably when I was fixing an old Iskra 111 calculator. It worked after I recapped the power supply.
Интересно, магнитофон монофонический, 3-й класс, а сделали такой мотор, видимо коллекторные не лучшие были. В некоторых магнитофонах они все-таки были, двигатель ДП, с платой регулировки, но во многих ставили уже японские MITSUMI, у меня есть электроника 302 с таким японским двигателем 1987г магнитофон.
Great repair! These electrolytic caps will pass away, worth to change all of them. If you see them so rid off next caps models: К-50-12, К-50-6, К-50-16, K-50-35, МБМ. Worth to check all K-50-24 and K-50-3. Any cap if vloss more than 2% remove it (don't ask, just do it).
БДС-0.14М upgraded synchronous brushless motor 0.14W power Б - бесконтактный (brushless) Д - двигатель (motor) С - синхронный (synchronous) М - модернизированный (upgraded)
There are lots of uses of electrolytic caps in audio circuits where the ESR does not matter. If your 10u capacitor is in series with 1k ohms, it doesn't really matter if its ESR is 2 ohm or 20.
Very true, ESR doesn't really matter in a small signal circuit. I've been telling people that since forever. You can save so much time by not replacing every single capacitor you encounter. If it sounds good and the caps don't physically leak (or are made by Matsushita, they WILL leak) you're probably good. Though some caps should be replaced for safety reasons or for preventing cascade failure, that's good practice.
@@BDYT1422 How do you know this device was fixed by a Russian and not, say a Ukrainian? Or a Latvian? Or an Estonian? Which were ALSO part of the Soviet Union.
Hey, a great video as always. Thanks for uploading such educational videos. Us beginners in electronics can learn a lot of things from your videos. I got into electronics because of your videos. So thanks for the videos you make. Also, that black screwdriver in the beginning is Bulgarian. The currency in Bulgaria is Levs, лева(лв.) in Cyrilic. That's what is says on the screwdriver. And that marking on the top of the motor says Bulgarian Standart, or БДС(Български Държавен Стандарт). So I guess that the Russians got some of the parts from us. Greetings from Bulgaria :)
Always interested in the modern death trap PSUs, but Vintage is more interesting because more skill went into making them. I own and refurbish many portable Transistor Radios like Bush and Hacker with the Germanium Transistors and big Speakers. I build rechargeable Battery packs to run them, made from Lithium Ion cells taken from old LapTop batteries. Full BMS protected, Voltage regulated and current limiting for added protection to help prevent Thermal Runaway in the output Pairs. David, East Coast of England Radio callsign G1ZQC.
Nice video. Surprised to see in this a BLDC motor. The screwdriver is actually Bulgarian by the way ;) There is the price on it written - 0.2 leva (0.2 лв )
I'm excited for the BM365. I wonder if it actually needs any service to get it to work. These old Tesla machines are quite well built. From my experience, they almost always only need to have the paper caps replaced and afterwards will work just like new. I haven't had the need to replace any smoothing caps in mine as they are great even after many years.
What an interesting desing. I wonder what's inside of mine similar looking tape recorder of that era, which is also made in late USSR. These decks got unusual unique key markings. There's no | | ► we as used to today. This confused me first time I encountered one.
As a teenager in the 70s, I spent many an hour poking around in malfunctioning cassette players, mostly to little avail. That video was an absolute joy, more like that please DGW.
A sensored brushless motor from the late 80s. I'm impressed.
They used a very simmilar thing even in mid 1970 recorders.
Good thing it's not a censored brushless motor!
I think it is for keeping constant speed. Like a tacho generator in many old machines.
Much better than modern tape players motors, probably.
Vintage soviet devices are ALLWAYS interesting! This seems to be built quite well, I would have never expected to see a brush-less motor in this, they really went to town when designing it.
Built well but dont survive too long, they always have similar failure points and the motors in them are notoriously trash. They built complex things just to make your job worse when fixing it, lets not forget that they mocked themselves. In the Radio magazine that was published in the USSR they constantly published articles on how to fix your electronics, common failures and even sometimes mocked the soviet industry.
You could make polls on your community tab asking for viewer preferences regarding modern or vintage technology, etc. I personally really enjoy your videos about repairs, experiments and DIY stuff. I feel like there's more to learn from them than the USB charger videos, which are all kind of the same.
Well said. I agree, the wealth of knowledge is amazing.
Older equipment often has really interesting engineering instead of just a microcontroller doing everything.
ac erase AND brushless motor?
truly the future
AC erase wasnt that rare in the 70s, national RQ421 for example, pretty standard shoebox recorder has it. Brushles motor is a rarity on tape recorders at this era, away from DD decks and the late generation of Sony walkman which used bldc motors to improve battery life and lower the noise induced by the motor. More like a tiny cdrom spindle thing.
In all soviet tape recorders used ac erase system. Magnets are never used.
Permanent magnet erase is kind of more modern. A cost cutting measure found in cheap boomboxes and recorders from the mid 80s through the early 2000s and the few still left today. It wasn't really common before. Maybe for dictation machines or something.
Im 15 so never thought a cassette player could be this complex, learning new things everyday with you
LOL, it is a pretty elaborated unit indeed. If you have a look at the 90s units you will be suprised how simplified (cheap) they got. OF course, they didnt lasted long and the sound was awful.
cheap and nasty cassette units is why people associate cassettes with poor sound.
Beautiful video, Dany K 📼
Me as kid in the 80s had a cassette-radioplayer, it was of the brand Audiosonic.
Was very nice to record music into cassette and then play it on my Sony Walkman.
The memories of the past, thanks for reminiscing it 🔴
Thank you for taking the time to fix it. I think fixing every piece of electronics has its own charms.
I think you should do more of these old devices because they are designed to be repaired and last a long time. New ones are just designed to be replaced.
This motor and driver deserves a video of its own with full details
"Each year people are dumber." Ya bud. Whenever you think that they can't any get dumber, they enthusiastically prove you wrong.
Thats normal after you turn 16. Each year life gets worse and people dumb and hateful.
Oh stfu, this has been around since the times of Socrates, yet here we are.
"In Babynon, on a clay tablet, was written "now the world with this younger man is so awful that in a matter of years, the world will go to hell' and here we are over 2000vyears later and the world is still here" - Georgy Mikhaylovich Grechko
I love it when they put connectors on the boards so you can very easily take it apart.
Vintage devices are often interesting and they are a good match for your unique soldering style, so I vote for vintage!
Nice! Motor driver schematic explanation next? Looks very interesting! :)
You cna have a look at the UHER REPORT 4000 series which uses AC motor and three phase generation. The signal is generated by a conmutator, not by pick up coils. Driver circuit should be smiliar (?)
the mid point of coils ABC is connected to supply. ABC ends are on the collector of 3 power transistors towards ground. the power transistor base is driven by pnp pre-amplifier with a capacitor (low pass filter) and a diode (half wave rectifier) on its own base. The ac (rectified by the diode) is generated by the pick-up coils on the motor. the rotor shaft couples and de-couples the pick-up coils to the magnetizing coil. the magnetizing coil is driven by a push-pull oscillator.
TL;DR the rotor determines the magnetic coupling that powers and drives the power transistors
Google for strings "бдс-0,2", "бдс-0,2м" and "бдс-0,14". These are the known varieties of these pure slavic motors. Also google for model names "весна" in conjunction with the word " схема", that means schematic.
The problem is a full motor description is not available for the 0,14W model, so you have to find and read one for the former two models.
Also seek for the related Russian IC named к157ха3".
I was in high school in 1988. That thing was made at an exciting time ;). Hard to believe it has a DC brushless motor, but that might be a reason it was expensive. Perhaps most surprising is that the belts are still good; there are likely no "western" cassette drives or turntables from that era or even later that still have working belts. I like both the old and news devices; I'm interested in whatever you want to investigate.
I've seen plenty of tape machines with "good enough" belts, some were from the EARLY 70s and didn't seem to have been replaced. It boils down to how much it was used and sheer luck with the rubber composition, rather than the place of manufacture. 90s belt seem to be the worst though I would say.
Have a Sanyo machine of that vintage which still works, also an early walkman (fancy one with auto reverse) that is fine. On the other hand a TEAC home hifi cassette deck, the belts perished a few years ago.
Awesome vid as always 👍
Please show more vintage devices, whether you are repairing them or just explaining how they work. It's always so cool to see how things were built back in the day.
My favorite vintage repair from you was the Junost 603. After watching you repair that one, I just knew I had to have one, so I picked one up from eBay :D
After replacing all the bad caps and one failed resistor it's now working again and sitting on my desk right besides me 😊
Hello, I really appreciate the videos about older technology. I feel like these is a lot more to learn, and the video is more interesting to watch when the old-school analog circutry can be explained, rather than it being one chip doing everything. A good example was the Soviet TV series, my personal favorite of your videos, you've taught us a lot about how it worked and that made the videos really fascinating.
Thanks for reading and take care.
Wow, impressive stepper for a 80's cassette player!
23:47 the motor driver is so interesting, i can recognize on the right a speed feedback and i believe that the winding on the left (the one on the adjustable plate) are determining just wich transistor switch on for the 3 phases so a sort of position feedback, seems to me that the speed feedback circuit is changing a bias for the position feedback and probably it result in a current regulation of the motor... Just crazy, so complex and jet simple, if we think that today we use encoder and microcontroller to drive 3 phase motor, i believe no one today would think to an analog way to drive this kind of motor.
I love those things and i love your video Mr. Diode, keep going like this!
3 phase brushless motors are usually monitored via winding feeback or a hall sensor, which both require more processing, and cannot be achieved at all or in a cost efficient way via analog. A Encoder would be way more expensive and I have yet to see a brushless motor that uses encoder monitoring in anything i bought in the last 20 years.
Loved this video! I’m a big fan of vintage audio equipment repair❤
The fuse holder looked like an interesting solution :)
The old stuff is great! An analysis of the motor driver board - forward/reverse, two speed, all transistor - would be fascinating
There is no forward/reverse to drive this motor. Motor always rotates the same direction, same speed.
Always good to see old stuff being repaired.👍
Having been a cassette deck enthusiast since the early 1980s, and just finished restoring a Nakamichi deck from 1980, I can see that this is much simpler than what I'm used to. Never seen a Russian deck before. That motor drive sure is over the top for a machine like that!
Great save. That tape player will run for another 50 years now. I like how it still worked with half the components in it failed.
Super video! Love this old Soviet-era equipment.
24:12 clearly the soviet version of The Ketchup Song 🤣
Haha, true :D
This reminds me of playing the good old GTA Vice City back in the day.
I love cassette related devices repair videos! Keep them coming!
The motor is marked with Bulgarian state standards abbreviation 🇧🇬. Probably manufactured by the disk memory devices factory.
What a beautifully made device. I enjoy watching these videos of the older stuff, particularly the Soviet items, they seem so well made; no built in obsolescence.
We need more old stuff videos. Preferably osciloscope.
Finally ❤ this video came!! and I'm happy that it's a long video but definitely not a "Bloody Long" video 😁 and I enjoy your super informative videos more than any movies 🎉
-- love and support from India 😇
I love seeing the old Soviet technology. Ultimately, I will watch everything you do 🙂
4:08 aw man the times when i used to shove pieces of napkins inside those holes to record on protected cassettes. Good times.
Thanks. I’d like to see repairs of more Soviet era electronics.
Thank you for your support ;). A small soviet oscilloscope is on my list, and some Czechoslovak things (the BM368 hf generator, the BM566A 120MHz scope and the DS-35 stopwatch).
I believe the motor was made in Bulgaria because of the БДС marking. It stands for Bulgarian National Standart.
Скорее всего нет. На моторе стоит штамп "ОТК" русскими буквами. А название "БДС" расшифровывается как Бесколлекторный Двигатель С...
БДС = synchronous brushless motor
Fuses need to be like banknotes: every value a different size. This way people won't put the wrong one.
The problem is people are very ingenious when it comes to defeating safety. Like using .22 bullets for fuses, or wrapping the old fuse in aluminum foil.
@ozzymandius666 do they have some way for blind ppl to feel what banknote it is?
They do in Australia
@@Barten0071 In Poland we have printed shapes with thick paint. Sizes also differ, but I don't know if they are distinct.
@@haczyk84 wiem pytałem o kanadę
Nice trip down the memory lane. Motor development went into the right direction.
Please more repairs of vintage stuff. 😊
Thank you for the interesting showcase + repair! Love to see more of this kind, build quality and repairability is so much different to today's mostly throw-away devices. At its time this recorder was probably really expensive. But that also encouraged its buyers to take good care of it so it could last as long as possible. I honestly can't imagine today's tech in such a condition in 40 years, especially regarding repairs... If some flash memory in one of the many microcontrollers deteriorated by even losing one byte, nothing will work any more and it will be probably impossible to repair. Even when replacing the microcontroller there won't be any way to restore its flash memory...
Love these old stuff ❤ just insane how the quality standard went so down for the cost reduction sake.😢
I used to add 108KHz bias on recorders I made and they worked excellently. Those were the days. Next server power supply please and more of such vintage products. Your channel should cross 1M subs soon.
Fantastic video. I have learned so much about electronics watching your videos over the years. Thank you 😃😃😃
the screwdriver seems made in Bulgaria, since the currency printed on it is in лв (bulgarian lev) :D
Thanks :) I was too lazy to try to decode the marking :D.
Your contents are great. I will watch all of them regardless of about old or new devices 😊
Двигатель именно такого типа использовался в этом магнитофоне для того чтобы снизить шумы по цепи питания в аналоговый тракт, а так же значительно повысить ресурс в целом ведь такие моторы по сути не обслуживаемые и могут много лет работать. Они более надежные чем коллекторные. Ну и такой мотор потребляет меньше тока, ведь планировалось возможность использовать батарейки.
Wow very nice explanation and nostalgic video of a tape recorder repair!👍
Thanks your videos are always a pleasure
I Have worked on tape recorder for years as a hobby. Never seen this kind of motor in a consumer grade device. The only recorder I remeber using AC and three phase inverter was the UHER REPORT 4000 series. This was done to take the motor noise generated by conmutators and mechanical gobernors out of the circuit. The mechanism has two flywheel, the second one was added as a back check flywheel to improve stability. Not a close loop thing (it would be crazy to find it on a consumer recorder). The olva speaker and some of the internal connections is Grundi-sh. And the 309 number remind me more like Philips used to mark their recorder in the late 70 and early 80s. Also DIN sockets and some Euro symbols. Looks like pure quaility to me.
The first digit in number of soviet devices means the class of equipment. 0- highest class (the best devices), 1, 2, 3 - first, second and third class. Third class is the lowest.
Some of the more high tech Sony decks from around 1980 also had this set up (brushless motor with belt). I don't know if it's really better, a standard DC motor with the 1" mount might fail more often but it is very easily replaced, even now. This one lasts longer but when it's done, that's a real problem. Also is the W&F any better, as the belt is still present?
And yes, this thing reminds me of Grundig units from the late 70s, with all the connectors, everything neat and tidy almost like mil-spec units.
@@westelaudio943 You are righ. I dont think that they would have done any better than FG Servo. Probably they want to avoid potential noise from the motor and keep tight control of the speed without worrying about wear. Because the DC Servo ones, are ok, but suffer a bit of drift on temperature and as the age, the speed control turn a bit unstable, because the internal resistance goes high. But even medium level deck have made out with this DC servo motors, the are long lasting. Sony like the FG Servo approach, but I saw 2 o 3 speed circuit on Sony Service Manuals and CANT figure out how they "lock" the motor. Seems pretty basic circuit, I would expect a PLL or someting more elaborated around the FG feedback. Like they are not taking fully advantege of it.
@@38911bytefree
The Matsushita FG servos seem to be rather unreliable though, they become noisy (mechanically) and sometimes the internal IC (with the Hall sensor) even fails, often intermittently. When it fails though, it's not a problem at all. Just get a Mabuchi in there and if nothing else you can still get a cheap modern clone, even those work seem to work alright, for how long I don't know.
I like standardized parts!
I thought about decks like the TC-K65 from Sony. No Idea how the capstan belt motor's controller works, but it's brushless and looks like this one. The whole deck is cool with interesting features but it is a "mechanical nightmare" with random wires going everywhere. I just opened it up one day and thought "nope" LOL.
@@westelaudio943 Yer, I think the 55 II also uses the same apporach. Grundig have a weird capastan motor in one of its 80 decks. I cant remember the model. But I have a JVC TD-W662 and the DD motor ... the chip is from a 5 1/4 floppy spindle . Probably in at early 80s with floppy drives being DD and VCRs ... they started to move this into the cassette. The sonys FG servo I saw (3 decks) the has a signal wire and the power wires. The signal was feed to a circuit. The sinal is passively generated by small geared flywheel that moves on a winding. Pretty small really. It is fitted below the top bearing. Yes, they can be noisiy and the brusheds go out quilcky too. Mabuchi and Matsushita are both EXCELENT. No content. Sankyo also made pretty good stuff. I have a Sharp from 87, still in it original Sankyo motor, that is Sharp Branded. Speed never need to be adjusted.
Amazingly well built and designed for A Soviet Area cassette.
It would be nice to do some recording tests on it.
I love your cat. I also love your breakneck energy and humour.
great video. This vintage stuff is very interesting. And there's not a lot of content related to the soviet stuff in youtube. keep these weird eastern devices coming up!.
Ďakujem ti za toto veľmi pekné video, dobrá práca s opravou kazeťáku, uvítal by som viac takýchto videí so staršou technikou, najmä tie digitrónové stopky a ten elektrónkový VF generátor vyzerajú veľmi zaujímavo. A ešte k tomu kazeťáku, musím uznať že je celkom kvalitne vyhotovený, vf mazanie a predmagnetizácia, elektronicky riadený motor (bezkartáčový), prepínanie typu pásky, počítadlo, indikátor vybudenia, to všetko sú prvky magneťákov vyššej kvality, než bola bežná povedzme v 90. rokoch. Budem sa tešiť na ďalšie videá, najmä s tými prístrojmi na konci videa (ako som spomínal na začiatku komentára), ktoré vyzerajú luxusne.
Thank you for your inspiring videos. Always fun to watch and great to learn from your experience.
The reminds me of the childhood in the GDR, when we were used to such types of audio stuff. More of it please.
As a russian, I'm impressed you read the writing, decoding every message you can. Like, someone could've just ignored and go with it. I appreciate the attitude and effort you take in making these videos.
P.S. I can confirm that there's no mistranslations. Nice!
@@ЯСуперСтарvery likely he had russian lessons in school
They just dont build things like this anymore. overbuilt and almost indestrubtible and if something was gonna fail, easily fixable. I miss this :(
It's pretty good, except the capacitors in hot areas getting cooked.
wow, even in a vintage model where quality is high, i didn't expect a brushless motor, it would have been much easier to use an AC motor
An AC motor would make the speed stable without much effort, but this recorder was designed to be able to run on batteries too.
I'd love to see some reel to reel recorders. I used to have a MAYAK-205 that slowly broke down
Thank you. I really enjoyed this repair.
This motor type БДС, is an own exclusive design of the VESNA plant. Since 1976 in Vesna 306 model, you also have video about it
The ussr did have some interesting stuff. For example it was common to have ungrounded low voltage distrubution (both 127 and 220 V) so you could only get shocked if you touched both wires. 230 V IT grid can be found in Norway too.
Thanks for doing this one man, glad you did it.
Hi Danyk. How did you remove the belt wheel from the axle of the motor? Is it press fit? Do you have mini removing press dedicated for that? Or maybe there is little grub screw at the side of belt wheel?
Thank you for all your videos :-)
Brushless Motor in a tape recorder! Wow!
BLDC motor? Well, that was unexpected. Not in a low-end recorder like this... I'd sooner see one in a turntable or a hi-fi R2R / cassette deck. The boards are pretty nice too.
And the transistor is... Dodgyyyyyyy!
I routinely replace these old Soviet electrolytics. Far more often than not they gave me trouble, most notably when I was fixing an old Iskra 111 calculator. It worked after I recapped the power supply.
BRG fej. Szép :) BRG a régi magyar elektronikai gyárak egyike
Интересно, магнитофон монофонический, 3-й класс, а сделали такой мотор, видимо коллекторные не лучшие были. В некоторых магнитофонах они все-таки были, двигатель ДП, с платой регулировки, но во многих ставили уже японские MITSUMI, у меня есть электроника 302 с таким японским двигателем 1987г магнитофон.
Love the video. I like older stuff better indeed
I loved this video, keep recording more of this!
BLDC motor in the cassette deck, high end device.
nice fix, and why did they put such a complex motor inside of it? It's because this type of motor are better to get accurate speeds or whatnot?
Great repair! These electrolytic caps will pass away, worth to change all of them. If you see them so rid off next caps models: К-50-12, К-50-6, К-50-16, K-50-35, МБМ. Worth to check all K-50-24 and K-50-3. Any cap if vloss more than 2% remove it (don't ask, just do it).
МБМ is not electrolytic, Металло-Бумажные Малогабаритные (aluminum foil with paper dielectric, no electrolyte)
haha, the screwdriver is Bulgarian made, that cost 0.20 BGN
Nice work.
12:30 "БДС" on the motor - Български Държавен Стандарт - Bulgarian State Standard. Unless the abbreviation meant something else in Russian.
БДС-0.14М upgraded synchronous brushless motor 0.14W power
Б - бесконтактный (brushless)
Д - двигатель (motor)
С - синхронный (synchronous)
М - модернизированный (upgraded)
Brushless Motor Synchronous makes sense. Many product names like named by Yoda were :-)
I definitely appreciate the Eraser head! :D
Brushless powertool motor for cassette mech now thats quality
Man, these old oscilloscopes are something else, really reliable things. I have to power up my old Hitachi, I wonder if it still works 🤔
yes. more vintage stuff pls !
There are lots of uses of electrolytic caps in audio circuits where the ESR does not matter. If your 10u capacitor is in series with 1k ohms, it doesn't really matter if its ESR is 2 ohm or 20.
Very true, ESR doesn't really matter in a small signal circuit. I've been telling people that since forever. You can save so much time by not replacing every single capacitor you encounter. If it sounds good and the caps don't physically leak (or are made by Matsushita, they WILL leak) you're probably good. Though some caps should be replaced for safety reasons or for preventing cascade failure, that's good practice.
Vintage :) vintage of course :)
Soviet people back in the 80s are “really creative” with their fixes XDD
Bridged fuse, wrong screw types. They easily make me chuckle!
USSR, not russians
@@alexk4894 1. I was talking about the people, not the country
2. They’re the same aren’t they?
@@BDYT1422 How do you know this device was fixed by a Russian and not, say a Ukrainian? Or a Latvian? Or an Estonian? Which were ALSO part of the Soviet Union.
If y’all are gonna be really specific, fine. I changed it to Soviet people. I hope you’re happy.
Thank you.
Keep up your good work
Hey, a great video as always. Thanks for uploading such educational videos. Us beginners in electronics can learn a lot of things from your videos. I got into electronics because of your videos. So thanks for the videos you make. Also, that black screwdriver in the beginning is Bulgarian. The currency in Bulgaria is Levs, лева(лв.) in Cyrilic. That's what is says on the screwdriver. And that marking on the top of the motor says Bulgarian Standart, or БДС(Български Държавен Стандарт). So I guess that the Russians got some of the parts from us. Greetings from Bulgaria :)
Always interested in the modern death trap PSUs, but Vintage is more interesting because more skill went into making them.
I own and refurbish many portable Transistor Radios like Bush and Hacker with the Germanium Transistors and big Speakers.
I build rechargeable Battery packs to run them, made from Lithium Ion cells taken from old LapTop batteries. Full BMS protected, Voltage regulated and current limiting for added protection to help prevent Thermal Runaway in the output Pairs.
David, East Coast of England Radio callsign G1ZQC.
Nice video. Surprised to see in this a BLDC motor. The screwdriver is actually Bulgarian by the way ;)
There is the price on it written - 0.2 leva (0.2 лв )
DiodeJunctionGoneWild on that failing transistor.
Wow... that motor is SO over-engineered. :)
Very cool vintage gear, please.
Old is Gold
First I have seen of a cassette machine using a synchronous AC motor. Its also not typical to find AC bias or DIN audio on such a portable machine.
Love these repair videos :D
I feel like I want to record modern song onto this cassete player. And feel how it feels like to play modern song on vintage music player feels like.
I am fascinated by Soviet engineering.
The transistor is probably КТ3102Г, and BC547 is a direct replacement :)
I'm excited for the BM365. I wonder if it actually needs any service to get it to work. These old Tesla machines are quite well built. From my experience, they almost always only need to have the paper caps replaced and afterwards will work just like new. I haven't had the need to replace any smoothing caps in mine as they are great even after many years.
Paper caps ?
@@erikdenhouter Yes. The "poop caps" which were sometimes used by Tesla have paper inside
@@xxexplosivexxxxexplosivexx8512 👍
unbelievable, they use such over engineered motor in the 80 for just such cassette player
More old soviet / east Germany Audio thingys. Yes please 😊
What an interesting desing. I wonder what's inside of mine similar looking tape recorder of that era, which is also made in late USSR. These decks got unusual unique key markings. There's no | | ► we as used to today. This confused me first time I encountered one.
Would love the vintage devices ❤