Miss you Shanggo. I pray that you are well during these fires. I’m in the IE where we always have fires. I’m a retired Broadcast Engineer who had a start when I was 16 observing techs in the back of the Magnavox TV shop on Sepulveda Bl In Manhattan Beach. I was the first girl taking Electronics at Mira Costa HS and TV/ Stereo Repair at SCROC in Torrance.
Great video as always. I always get amused by armchair technicians who think they are educating a seasoned professional. One thing I have learned is the more I know about something the more I keep my thoughts about how it should be done to myself. Especially when it comes to cars which is my field of expertise. You may know a pattern failure but just when you think you know is when the car will give you a spanking and feed you humble pie. I do enjoy watching other professionals work. Always something to learn.
Winter here in Chicago has been cold but dry . No real rain or snow (to complain about). Things seem to be always worse somewhere else. You're always informative and entertaining Dan and that goes for your car repair channel too.
To your transistor question, yes. I've seen the gain drop on RF transistors over time. Some of the power transistors have multiple transistors in parallel on the die. As each tiny transistor opens, gain is reduced. Thanks for the Saturday video. It was a relaxing 74 minutes.
The voltage tripler in a TV set is fed with the asymmetrical sweep signal (short positive high voltage pulse during the retrace followed by a much lower, almost negligible negative voltage during the longer sweep phase); that is why the voltages on the 3 diode taps do not follow a linear rise, as would happen if feed with e.g. a symmetrical sinusoidal or square signal. That's also why color TV "triplers" have 6 diodes: they are in fact sextuplers, with only 3 of the 6 stages providing useful multiplication.
I was under the impression that transistors stayed at the same value unless they failed. It is gonna be 35c today because it's Summer here in Australia. I thought that America was ball freezing cold. Stay safe mate, Andy from OZ.
I restore and repair the 60’s and 70’s receivers. Several have had those tubular caps causing issues with the FM Stereo quad detector. You are spot on and really have a knack for these circuits. I like your approach to the issues.
" Shangoo oh...shango man.....shangoo oh....shango man... shangoo oh...shango man" Imagine this to a deep mystical African tribal beat with the drums thumping the air, the Shango warriors stamping their feet in unison with this natural rhythm. Slowly the ash fell from the trees and from the mountains and lastly from the skies above, after delivering his people into clean air and sun kissed back yards he banished the 'focus rings' into the land of 'bollocks' forever.
To ALL... Shango is one of the best and very kind to do these videos to help others. He knows more about TV than most people will ever know. So Please stop the foolish comments about focus rings on a crt. It is oblivious viewers who make stupid comments have no idea of what they are talking about. Don't be so vicious and unkind to Shango. If you don't agree with Shango then go to another channel but don't criticize him about something you don't know. Very mean people.
Focus magnets (nicknamed “focus rings” but they’re actually a lot wider than regular neck rings) do exist but - here in the UK at least - manufacturers stopped using them around 1956/57/58 when electrostatic focusing came in… like this set uses as Shango mentions a few minutes in. In 1969, a new set using technology from the mid-50s at the *latest* would have been archaic and pointless as every CRT manufacturer was making CRTs designed for electrostatic focusing.
Great video! That is an absoulutely cool set. Great to see the continued work on the Sears units. Interesting to see what you have to do to figure out the soft CRT problem. Good thing you have multiple sets to help you out. Facinating units. Seemed like an awesome picture with that good CRT. 🍻
Another fine job, my friend. But... you do have to agree that the weak tube was due to the focus rings dun gone gassy ;-) PS Maybe somebody will gift you a solder suction station for your birthday if you're good.
I totally agree that de-soldering takes a lot of sustained heat and always tends to make a mess of things. I keep some low melt solder around just for that task. It helps speed up the process immensely. Plenty of flux and flow in the low melt to replace the normal solder. Then be sure to clean off the low melt when re-soldering.
I think the reason the voltages in the tippler is not as you expect is the intermediate voltages are pulses, but the output has a filter cap (the CRT). It's like the difference between half-wave rectified without a filter cap and with a filter cap.
I thinks the set with the week pitcher bulb is baked. If you were to test and replace every part more than 5% out, you would still have baked. You can't save them all. We ALL appreciate all of your efforts, though. Thanks.
I lived in LA for 47 years.... this is the worst fire season in my memory. And yes, it's a California thing..... but "Management" is definitely NOT blameless. You live in hell, you prepare (far better) for hot weather. But they love to spend money for a bunch of nonsense instead. The problem now, is that the mud slides are yet to come..... stay well out there. 🙏
I didn't consider that... If you guys get heavy rain after a drought it can trigger mudslides, and the lack of vegitation on the hillsides isn't going to do any favors either... Hope your desperately needed rain isn't too much when it finally arrives.
some of these small screen 'portable'/'solid state tv' type crts didnt bother with focus taps or pots but linked the focus electrode direct to the A1/screen eelctrode ,
@15:08 - Each time I hear the word Trippler (Tripler) I cannot help of think of the Army Medical Center in Hawaii that pulled out my fathers kidney and nicked his lung back in 1981.
Focus magnets (nicknamed “focus rings” but they’re actually a lot wider than regular neck rings) do exist but - here in the UK at least - manufacturers stopped using them around 1956/57/58 when electrostatic focusing came in… like this set uses as Shango mentions a few minutes in. In 1969, a new set using technology from the mid-50s at the *latest* would have been archaic and pointless as every CRT manufacturer was making CRTs designed for electrostatic focusing.
So I worked at this hardware store in Albuquerque, it's called Samon's. And they had these old terminals, W-Y-S-E terminals. And these things have been running like non-stop, day on, day off. It must be like years and years, decades. And you know, I remember using them and they still worked. You could still see them, you could still see the numbers, the letters, everything was fine, you know. And they were bright enough too. I mean, you had to turn the brightness up a bit, but you could still see what they said. So, you know, it really calls into question, you can't see it in the daytime. You know, if it's a consumer set, I don't understand.
I used to run a 300 ton Pacific press that had an early ‘90s CNC interface. Similar tube. The thing was so burned in that you could see the normal readout pattern with the unit off, through the amber filter. Picture was soft but still legible and bright. Who knows how many years it had on it, running probably 20 hours a day 5 days a week.
My dad bought 3 of those Sears Tv's for the family back in the 60's. All three had the vertical buzz in the audio. I think it is a design issue. I kept one to recap soon.
Three blind sets. See how they run. He changed their capacitors just for fun. They all ran after Shango was done, Did you ever suspect the trippler diodes were gone?
When testing capacitors in those generic Chinese transistor testers, it's worth noting that you will get a capacitance reading that is presumably high. If you press the test button with nothing in the tester your likely to get 20 pF - 30 pF reading open circuit. Unless you've found some secret to null this. However, the capacitor you used for the replacement had a pretty similar reading, so I'd guess that one was in the lower end of it's stated tolerance.
Probably about 20 years ago, we had one of these in our break room at work, that had the Magnavox name on it and at that time, the picture was doing the exact same thing just real soft. I’m just wondering if it was just a design flaw in the thing 13:34
At 1:11:35 it looks like it's overscanned. (I suspect the air in that area is thick with carcinogenic asbestos fibers from the burning of the construction materials of those old, expensive homes, along with vapors and dust from heavy metals. That's a pretty dangerous place to be, likely for some time to come. Staying inside with adequate filtration systems would likely forestall the advent of any medical condition requiring treatment.
A transistor can drift over time. They actually call it "transistor aging". The semiconductor material can corrode or degrade over time, just from exposure to air/moisture.
Text (maximum contrast dense patterns anyway) generates the buz in old TVs and even the more modern ones built on not the last several generations of mass-produced analog TV processing ICs do buz with the common in the last 30 years computer style text overlays and high contrast pictures with lots of sharp lines or borders.
You should get a home air filter to help keep the indoor air relatively clean. Those particulates don't just spoil videos, they're bad for your health. I like electrostatic air cleaners because they are good for fine particulates and are free to hose down the collector plates compared to paying for more HEPA filters.
@@shango066 Before that happens, would you guide me to a company where I could purchase a power switch plastic knob for my 1972, 12" B&W Sears tube TV?
With regards to your comment around the 10 minute mark. I have come across older transistors that test fine in a tester (no shorts or opens) but if you measure the hfe it is really low and they no longer work correctly. Even some of the 80s ones were known to be problematic (I do recall there are a load used in reel to reel machines that often suffer the same fate). Really threw me for a loop too trying to pinpoint the issues.
Whoever made that comment about the focus rings was only showing their ignorance and stupidity. On that note, I'm surprised that someone didn't suggest changing the focus capacitor, LOL.
that diode arrangement in the set is a doubler, not tripler...the schematic is misleading, there was a tv chassis in the uk that had a doubler for crts 20 to 22 inch, a tripler for sizes above, and the doubler unit had 3 diodes plus 2 capacitors as here, the tripler 5 diodes 4 capacitors
09:35 The chinese clip leads are not made from copper wire, that's why they have atrociously high resistance. Hold a magnet to them, then you know what's going on with them.
How can leaving a critical reservoir empty for a year for a simple repair not be the fault of the government bureaucrats? The lack of fire mitigation after record rains last year, causing so much dry vegetation, was like placing a moat of gasoline around those homes with little to no water to fight the fires.
Miss you Shanggo.
I pray that you are well during these fires.
I’m in the IE where we always have fires.
I’m a retired Broadcast Engineer who had a start when I was 16 observing techs in the back of the Magnavox TV shop on Sepulveda Bl In Manhattan Beach.
I was the first girl taking Electronics at Mira Costa HS and TV/ Stereo Repair at SCROC in Torrance.
Great video as always. I always get amused by armchair technicians who think they are educating a seasoned professional. One thing I have learned is the more I know about something the more I keep my thoughts about how it should be done to myself. Especially when it comes to cars which is my field of expertise. You may know a pattern failure but just when you think you know is when the car will give you a spanking and feed you humble pie. I do enjoy watching other professionals work. Always something to learn.
I took a screenshot of the new food pyramid 💪 Thanks Shango from central Florida 🌴🇺🇸
Eat your bugs with the shell, much healthier! 🦗
Lol I did the same thing and sent it via text to at least 10 different people.
Still the most entertaining TV and Radio repair videos on UA-cam.
You explain the Southern California fire situation far better than a lot of the media outlets in California.
@0:10 - I want a picture of that food pyramid. The original food pyramid has been helping to unalive people since it's inception.
Winter here in Chicago has been cold but dry . No real rain or snow (to complain about). Things seem to be always worse somewhere else. You're always informative and entertaining Dan and that goes for your car repair channel too.
Another Great video , love seeing these old sets brought back from the dead 😂
Not even arson attacks can stop this man.
To your transistor question, yes. I've seen the gain drop on RF transistors over time. Some of the power transistors have multiple transistors in parallel on the die. As each tiny transistor opens, gain is reduced.
Thanks for the Saturday video. It was a relaxing 74 minutes.
The voltage tripler in a TV set is fed with the asymmetrical sweep signal (short positive high voltage pulse during the retrace followed by a much lower, almost negligible negative voltage during the longer sweep phase); that is why the voltages on the 3 diode taps do not follow a linear rise, as would happen if feed with e.g. a symmetrical sinusoidal or square signal. That's also why color TV "triplers" have 6 diodes: they are in fact sextuplers, with only 3 of the 6 stages providing useful multiplication.
I was under the impression that transistors stayed at the same value unless they failed. It is gonna be 35c today because it's Summer here in Australia. I thought that America was ball freezing cold. Stay safe mate, Andy from OZ.
I restore and repair the 60’s and 70’s receivers. Several have had those tubular caps causing issues with the FM Stereo quad detector. You are spot on and really have a knack for these circuits. I like your approach to the issues.
" Shangoo oh...shango man.....shangoo oh....shango man... shangoo oh...shango man" Imagine this to a deep mystical African tribal beat with the drums thumping the air, the Shango warriors stamping their feet in unison with this natural rhythm. Slowly the ash fell from the trees and from the mountains and lastly from the skies above, after delivering his people into clean air and sun kissed back yards he banished the 'focus rings' into the land of 'bollocks' forever.
Buzztastics, I hope it clinco-torqulates something inside: let it rain.....
47:05 🤣
To ALL... Shango is one of the best and very kind to do these videos to help others. He knows more about TV than most people will ever know. So Please stop the foolish comments about focus rings on a crt. It is oblivious viewers who make stupid comments have no idea of what they are talking about. Don't be so vicious and unkind to Shango. If you don't agree with Shango then go to another channel but don't criticize him about something you don't know. Very mean people.
Shango makes it a humorous part of his videos. That is worth it to me.
Exactly, there are no focus rings, you have to move the yoke along the neck of the CRT to focus it.
JOKE !!!!! 🤣
Focus magnets (nicknamed “focus rings” but they’re actually a lot wider than regular neck rings) do exist but - here in the UK at least - manufacturers stopped using them around 1956/57/58 when electrostatic focusing came in… like this set uses as Shango mentions a few minutes in. In 1969, a new set using technology from the mid-50s at the *latest* would have been archaic and pointless as every CRT manufacturer was making CRTs designed for electrostatic focusing.
This is a great channel and a great guy. I believe I’ve learned so much watching him. I’m really appreciative of him doing these videos.
Great video! That is an absoulutely cool set. Great to see the continued work
on the Sears units. Interesting to see what you have to do to figure out the
soft CRT problem. Good thing you have multiple sets to help you out.
Facinating units. Seemed like an awesome picture with that good CRT. 🍻
Good evening Shango, glad you're safe, enjoying your repair video. Best regards from Nova Scotia Canada 🇨🇦 , Cheers 🍻 Scott
Another fine job, my friend. But... you do have to agree that the weak tube was due to the focus rings dun gone gassy ;-) PS Maybe somebody will gift you a solder suction station for your birthday if you're good.
When you hooked up the other tripler at about 19 minutes in, I found myself thinking “yeah, 14KV would get me pretty focused too!” 😂
Focus rings pmsl, Love the diagnostics in this you never stop until you get answer.
What is that description? Haha
I remenber seeing these on display in Sears downtown Louisville KY store. My dad and I paused to look.....
the 2nd time you brought up about adjusting the focus rings on the CRT I laughed out loud. I hope the commenter caught that.
That commenter split and went over to TikTo… oh wait… never mind. 😂
Greetings from Cape Town. Its summer, our fire season as well from November to April, but all is good so far. Shango….only the best.
Thanks for taking us along on the adventure.
That picture looked fantastic.
Baked!
"I SEE YOUUUU - ... I SEEE YOUUU IN THE SCREEEEEN!!" LOL - just quoting an earlier video. Fantastic work!
I totally agree that de-soldering takes a lot of sustained heat and always tends to make a mess of things. I keep some low melt solder around just for that task. It helps speed up the process immensely. Plenty of flux and flow in the low melt to replace the normal solder. Then be sure to clean off the low melt when re-soldering.
Focus rings LMAO! Glad you found a use for the triplers .
Those people lost a lot, but they have a lot, as well, with rents in the tens-of-K. Sadly, the "aunties" will grab what they can.
Thanks for showing the rental rates out there. NOW....I have seen everything-smdh!!!!!!!!!!!
I think the reason the voltages in the tippler is not as you expect is the intermediate voltages are pulses, but the output has a filter cap (the CRT). It's like the difference between half-wave rectified without a filter cap and with a filter cap.
Wish i could find one of those kind of TV's be good for my classic shows i like to watch. plus those sets look cool as well.
im 12 seconds into this video and already I can tell this one is gonna be a funny one.
Love these old Black and White TVs with a Radio added too .
I've watched many of your videos, and I've always thought you knew what you were doing. Some people love to criticize.
I thinks the set with the week pitcher bulb is baked. If you were to test and replace every part more than 5% out, you would still have baked. You can't save them all. We ALL appreciate all of your efforts, though. Thanks.
You should take a small set like that out into the desert and try to Dx with the TV part. I'm not sure how well it would work with digital signals.
I lived in LA for 47 years.... this is the worst fire season in my memory. And yes, it's a California thing..... but "Management" is definitely NOT blameless. You live in hell, you prepare (far better) for hot weather. But they love to spend money for a bunch of nonsense instead. The problem now, is that the mud slides are yet to come..... stay well out there. 🙏
I didn't consider that... If you guys get heavy rain after a drought it can trigger mudslides, and the lack of vegitation on the hillsides isn't going to do any favors either...
Hope your desperately needed rain isn't too much when it finally arrives.
@@volvo09
It never rains in California
But girl, don't they warn ya?
It pours, man, it pours
(Albert Hammond)
As long as the trees have their roots it should be fine I think.
Even here in Honolulu has been unusually dry
Very nice I am 56 from pakistan 1973 we have this type sanyo 20 inch tv valve double speaker very lovely memories with valve tube tv Now LED tv tcl.
Shango,you are the best.Please be careful with the fires.Mike the Greek
There is something about the sharpness of b&w sets, they had those things dialed
I had so many TV's that buzzed over the years... drove me nuts whenever some bright graphic would come on the screen. Watching the news was the worst.
Very interesting and informative troubleshooting! Thank You!
9:00 - absolutely *YES*, they do lose gain over time.
some of these small screen 'portable'/'solid state tv' type crts didnt bother with focus taps or pots but linked the focus electrode direct to the A1/screen eelctrode ,
I believe that transistors can reduce in gain over time, especially when they have been running hot.
"It Never Rains in Southern California" Albert Hammond.
That's a fact isn't it?
"It pours, man it pours..."
@15:08 - Each time I hear the word Trippler (Tripler) I cannot help of think of the Army Medical Center in Hawaii that pulled out my fathers kidney and nicked his lung back in 1981.
Focus magnets (nicknamed “focus rings” but they’re actually a lot wider than regular neck rings) do exist but - here in the UK at least - manufacturers stopped using them around 1956/57/58 when electrostatic focusing came in… like this set uses as Shango mentions a few minutes in. In 1969, a new set using technology from the mid-50s at the *latest* would have been archaic and pointless as every CRT manufacturer was making CRTs designed for electrostatic focusing.
I laughed so hard at the vacuum cleaner moment.
I look forward to Saturday Mornings with shango066 videos!!
Saturday night in Europe, yeah its shangotime🎉
So I worked at this hardware store in Albuquerque, it's called Samon's. And they had these old terminals, W-Y-S-E terminals. And these things have been running like non-stop, day on, day off. It must be like years and years, decades. And you know, I remember using them and they still worked. You could still see them, you could still see the numbers, the letters, everything was fine, you know. And they were bright enough too. I mean, you had to turn the brightness up a bit, but you could still see what they said. So, you know, it really calls into question, you can't see it in the daytime. You know, if it's a consumer set, I don't understand.
I used to run a 300 ton Pacific press that had an early ‘90s CNC interface. Similar tube. The thing was so burned in that you could see the normal readout pattern with the unit off, through the amber filter. Picture was soft but still legible and bright. Who knows how many years it had on it, running probably 20 hours a day 5 days a week.
My dad bought 3 of those Sears Tv's for the family back in the 60's. All three had the vertical buzz in the audio. I think it is a design issue. I kept one to recap soon.
Marcus Nelson Murders…That’s the made for TV movie that spawned the Kojack series in the 1970s. Who loves ‘ya baby!
Three blind sets. See how they run. He changed their capacitors just for fun. They all ran after Shango was done, Did you ever suspect the trippler diodes were gone?
I'm leaving this comment just to test how shadowbanned I am. Please leave a like if you see it.
My comments are always disappearing
Yep, rich people get given everything. That is why they are rich!
When testing capacitors in those generic Chinese transistor testers, it's worth noting that you will get a capacitance reading that is presumably high. If you press the test button with nothing in the tester your likely to get 20 pF - 30 pF reading open circuit. Unless you've found some secret to null this. However, the capacitor you used for the replacement had a pretty similar reading, so I'd guess that one was in the lower end of it's stated tolerance.
Mine does fine, the also generic MK-328. Of course, if you use long test leads it can add, but shangoo did not have one with test leads.
Probably about 20 years ago, we had one of these in our break room at work, that had the Magnavox name on it and at that time, the picture was doing the exact same thing just real soft. I’m just wondering if it was just a design flaw in the thing 13:34
Gotta love the MEME screen
Ah good your still there
At 1:11:35 it looks like it's overscanned. (I suspect the air in that area is thick with carcinogenic asbestos fibers from the burning of the construction materials of those old, expensive homes, along with vapors and dust from heavy metals. That's a pretty dangerous place to be, likely for some time to come. Staying inside with adequate filtration systems would likely forestall the advent of any medical condition requiring treatment.
That is a nice looking tv.
A transistor can drift over time. They actually call it "transistor aging". The semiconductor material can corrode or degrade over time, just from exposure to air/moisture.
Text (maximum contrast dense patterns anyway) generates the buz in old TVs and even the more modern ones built on not the last several generations of mass-produced analog TV processing ICs do buz with the common in the last 30 years computer style text overlays and high contrast pictures with lots of sharp lines or borders.
Focus rings erase crepe, chop veggies and center your chi! I want some!
19:30 ~schtop pointings and check em. check them ceramic caps for 500.. Alex..
You should get a home air filter to help keep the indoor air relatively clean. Those particulates don't just spoil videos, they're bad for your health. I like electrostatic air cleaners because they are good for fine particulates and are free to hose down the collector plates compared to paying for more HEPA filters.
HEPA with electrostatic and ozone. My purifier uses all three.
I have that in the house but it doesn't matter. The damage is done, We are all gonna die early from this shit
@@shango066
Before that happens, would you guide me to a company where I could purchase a power switch plastic knob for my 1972, 12" B&W Sears tube TV?
@@bblod4896 🤣 Fan of heavy metal
Let’s get clinky dinkling guys!
PS- One of My radio transmitter tower sites may be near you in the San Fernando Valley near the 5/118 fwy exchange 😊
my mortgage a month in Ontario Canada is only 850 a month lol
With regards to your comment around the 10 minute mark. I have come across older transistors that test fine in a tester (no shorts or opens) but if you measure the hfe it is really low and they no longer work correctly. Even some of the 80s ones were known to be problematic (I do recall there are a load used in reel to reel machines that often suffer the same fate).
Really threw me for a loop too trying to pinpoint the issues.
Newer B&W sets rarely had adjustments for focus.
Focus magnets. How do they work?
Some time when you have a terminal crt it would be great to see you blast it with rejuvenation.
Maybe try getting rid of that selenium rectifier. That can pull the B+ down.
Im just starting the video but i was thinking the focus fluid is low it almost the same stuff they use for blinkers in cars
Yea, when you squeeze your eye lids together the image is sharper, so use blinker fluid.
That tripler schematic looks suspicious to me.
shango time!
do transistors lose gain over time,? germaniums 'can' seem to, silicons, not really, but they can fail pretty much any way any time
I hope your roof is painted green or blue!
Whoever made that comment about the focus rings was only showing their ignorance and stupidity. On that note, I'm surprised that someone didn't suggest changing the focus capacitor, LOL.
that diode arrangement in the set is a doubler, not tripler...the schematic is misleading, there was a tv chassis in the uk that had a doubler for crts 20 to 22 inch, a tripler for sizes above, and the doubler unit had 3 diodes plus 2 capacitors as here, the tripler 5 diodes 4 capacitors
I've had transistors that test fine, but changing them cure faults.
The Time Of Change
Did you just leave an accidental private message in the youtube description or...
Yes transistors lose gain over time they do get tired.. not all of them but some do !!!
09:35 The chinese clip leads are not made from copper wire, that's why they have atrociously high resistance. Hold a magnet to them, then you know what's going on with them.
If I could ill send you the rain we got here then you had a week long rain without a break
What's the big deal about focusing rings?
trying to measure voltages in that doubler circuit can be misleading as theres short pulses there at some points, not steady dc
That’s really cool
How can leaving a critical reservoir empty for a year for a simple repair not be the fault of the government bureaucrats? The lack of fire mitigation after record rains last year, causing so much dry vegetation, was like placing a moat of gasoline around those homes with little to no water to fight the fires.
Make MTV great again
That statement is racist😅😅😅😅😅😅😅😅😅
What do the people do for work who pay $70,000 per month in rent?
They are tiktok influencers
@@shango066Soon to be very, very unemployed TikTok influencers…
Shango time!