Inside, that radio looks almost identical to a Koyo Parrot KR-4S1 whose schematic can be found on the web (they usually came with a copy of the schematic glued to the inside of the back cover). The Emerson 747 is also very similar, they are all based on the same schematic. Some of these sets suffered from open IF coils (corroded wire near the solder tab); can be repaired, but removing it with so many little components squeezed around can be a PITA. Fortunately, no silver mica disease, those IF cans use small tubular ceramic caps.
Koyo made some interesting sets I have a few, some Grundig satellites were in fact Koyo. I did not know they made a tube set thank you for the information.
24:31 you'll find that the 1V6 is a triode/pentode tube similar to a 6GH8A. The triode is used as a local oscillator, while the pentode is an RF amp and mixer. Good luck with your project! 😊
Wow, I have never seen or heard of a pencil vacuum tube portable radio like that can’t wait to watch the rest of the video. This is very interesting. Great content as always SHANGO!
FYI, if you can pick it up, 1090 XEPRS from Mexico is now playing '50s-'70s Oldies with a live DJ from 3-5 pm, plus old Wolfman Jack shows for 2 hours each day.
Picked one up about a year ago. Takes pictures via card to view on larger screen...etc. bought it for inslecting solder joints and future SMD work. And or SMD!
I got one of those and i have used it more to pull small plant stickers out of my skin than i can remember. Without it i would have never been able to see these small thorns.
1V6 triode / pentode converter, 1Ag4 "power" pentode (55mw output!), 1Aj5 diode/pentode detector, 1st af, 1AH4 IF pentode Triode/pentode converter is like 6ea8 or 6u8 type tube as in tv tuners.
I don't want to speak for someone else but for those who haven't watched Shango66 before; When he says he's not giving up, he means it. So look out for this miniature tube radio video soon 😊
Enjoyed this video and the microscope too, that will sure be useful. I have a Petite SNY radio identical to that one. Thankfully, mine worked as soon as power was applied.
That microscope also has an HDMI output to go to a a different display like a TV or other monitor *or* what may be of benefit is that you can use an HDMI recording device of some sort (easy to find these days) connected to it.
I have both the electronic microscope you are reviewing and a binocular microscope. I prefer the binocular due to the 3-D effect and it seems more natural with hand-eye coordination.
Just for a few seconds there I thought Shango was going to use some compressed air to blow some of the crud out of the Petite radio before beginning diagnostics. Nope! Solid as a rock.
Awesome new Toy, _not for bath time,_ eat before use. Love Microscopes, they sure have have changed. Took pictures with camera thru eyepiece, videos if critters were moving. _got in trouble at work for it_ lol didn't stop me. *Tiny Life is grand,* govt., not so much. Looking forward to the day. ... _define as needed._ *Cheers* 🇺🇲
Those tiny valves are super cool. Would love to see the radio worked on in a future video. Though I have to admit the wiring on the bottom looks like a nightmare. All the components looked to be wrapped around each other so where do you start.
Cool. Looking forward to the next video. The video with the debate is the longest video I've ever watched. Did they give her something to help her speak?
What you may find handy for the microscope, is to find a telescopic arm to fit it to (like on a lamp, magnifier, microphone). That will let you more easily put stuff underneath it.
The microscope is a nice piece of equipment but I wish it were cheaper. Years ago, I bought a digital microscope from China for about $20 that worked pretty decent but it runs only in Windows XP. I still have an old machine that it could run on. A couple of years ago, I bought a plain non-electronic handheld microscope that I have used to remove scratches from an lp record with a regular pin glued to a stick.
Wow Shango found a new toy to play with and it is a great one. Game changer videos ahead. The made in Los Angeles Hoffman Radio model IP-402 called the Nugget from 1954 it has the same 4 subminiature tubes in it and modeled after the Emerson 747. Their IF transformers couldn't get silver mica disease as the used tiny ceramic caps but corrosion in the IF transformer wiring could be a real problem. Take it out and examining it with a microscope like this would be beneficial!
@@shango066 Since the Emerson model 747 is so similar to the Hoffman IP-402 have you compared yours to the schematic and photos on line? Beitman's Vol 14, page 32 for the Emerson schematic. Got to say with all those Meg sized resistors inside it must have been hard on the 1.5 Volt battery!
@@hestheMaster I scanned the sams for the Emerson And figured out how to test those tubes. So with the help here in the comments I'm getting ready. I'm sure it's an open coil.
1. Shango wearing gloves to unbox a brand new item? 2. Testing these tubes? Any tube testers? Show us! 3. Magnification? Of this "microscope." Cellular level?
This micro scope looks great I bought a small one a few years ago when my wife was still alive she was the one who bought it for me and I only got a 4 or 6 inch one because I don't want her to spin too much I'm going to get a binocular one or a 12 inch one
The only issue I had with mine was the base being in the way. I mounted it to an old heavy-duty clamp on lamp arm mount. Now, it can be moved to any location on the bench. The only issue is the fact that it is much less portable.
Lemme see if I still remember... (-1-) Radio signal input is of VARIOUS frequencies so we TUNE an input tank circuit to a desired specific broadcast frequency. (-2-) to achieve an intermediate frequency (fixed I.F.) we MIX that incoming RF with an oscillator. The oscillator frequency varies with input RF tuning such that the result is the FIXED I.F. The variable tuning capacitor has two segments: one for input RF and one for the oscillator. (-3-) This I.F. mixing is done in a NON-LINEAR device that yields 4 frequencies: RF-in, Oscillator-in, sum of both, difference of both. Since these mixer outputs are selected/rejected by mixer ouput tank circuit only the DIFFERENCE is selected. This difference is the radio's FIXED I.F. frequency. (-4-) This I.F. frequency contains amplitude varied signal varied at audio rates. To extract the audio the I.F. is routed thru a DETECTOR diode to yield positive-only audio as both positive and negative cancel. The result is voltage audio. (-5-) As speakers require CURRENT to drive the magnets the audio voltage must be converted to audio current. This is the purpose of AUDIO OUTPUT stage. To convert voltage to current(power.) (-6-) There's more but isn't this the basic operstion?
I heard, that soviet military tech used these kind of tubes well beyond the tube-era. As example the radios in the fighter planes were mentioned. Reason was, that the a-bomb fries the semiconductors. Well it fries the user to, but at least the radio survives. I don't know, if it's true or just an urban legend, but it kinda fits the cold-war mindset.
The digital microscope is a nice tool, I have one. One issue is the more you zoom in the focus won't work well because the depth of field is great. It's better to zoom out more or use your hand held camera. Use the microscope only for very small items... Thanks for the video!
I really don't understand why this radio was ever built. It was likely more expensive than a transistor radio and more expensive to run while probably not being any better.
Digital microscopes are pretty eh for the price. Cheapest bi-ocular scope will run you about $200 and be better. Amscope SE400Z. I mounted it to a vesa monitor arm I got for $20 off marketplace. Got the idea from a few other people who mounted their digital scopes that way. Its well worth doing.
That booklet thing had a good amount of chinglish in it, lol , but hey, hopefully this product will last a lot longer then the usual crud they make today
I think the point of not showing his face in the videos isn’t an attempt to remain anonymous. Anyone doing a little digging will find several pictures of him online. I think the point is so that we have the visual perspective, like we’re working on the projects with him.
Calling it a microscope is a bit of an exaggeration, but even with the low magnification it offers (compared to a real microscope). I think it is a great tool ideal for tracking down broken solder joints on boards or something like that. 🔎
Inside, that radio looks almost identical to a Koyo Parrot KR-4S1 whose schematic can be found on the web (they usually came with a copy of the schematic glued to the inside of the back cover). The Emerson 747 is also very similar, they are all based on the same schematic. Some of these sets suffered from open IF coils (corroded wire near the solder tab); can be repaired, but removing it with so many little components squeezed around can be a PITA. Fortunately, no silver mica disease, those IF cans use small tubular ceramic caps.
Koyo made some interesting sets I have a few, some Grundig satellites were in fact Koyo. I did not know they made a tube set thank you for the information.
For static, fixed position shots. The Microscope seems very good.
For moving about, close detail video. I like what shango066 does with his phone.
Agree..
24:31 you'll find that the 1V6 is a triode/pentode tube similar to a 6GH8A. The triode is used as a local oscillator, while the pentode is an RF amp and mixer. Good luck with your project! 😊
That was very interesting. The tiny tubes and the digital microscope. I could use that.
The pinnacle of tube circuit engineering. Sweet. thanks
Nice how well the AUTOFOCUS works.
Nice a new addition to more exciting learning of older electronics what an eye opener for me thanks Shango loved it.
Wow, I have never seen or heard of a pencil vacuum tube portable radio like that can’t wait to watch the rest of the video. This is very interesting. Great content as always SHANGO!
I bought a Micro scope black friday last year from amazon !
FYI, if you can pick it up, 1090 XEPRS from Mexico is now playing '50s-'70s Oldies with a live DJ from 3-5 pm, plus old Wolfman Jack shows for 2 hours each day.
Is it for sale again? Yes the good radios will get it here
@@shango066 It's a brokered station, and "El Chacon" is leasing the 3 to 7 PM block, playing Oldies from 3 to 5 and the Wolfman from 5 to 7.
Shango time !! Greetings!!!
The review of the TM4K-AF microscope is really cool. Then we got the little pencil tube radio for extra coolness!
Picked one up about a year ago. Takes pictures via card to view on larger screen...etc. bought it for inslecting solder joints and future SMD work. And or SMD!
It’s Shango time boys!
I got one of those and i have used it more to pull small plant stickers out of my skin than i can remember. Without it i would have never been able to see these small thorns.
1V6 triode / pentode converter, 1Ag4 "power" pentode (55mw output!), 1Aj5 diode/pentode detector, 1st af, 1AH4 IF pentode
Triode/pentode converter is like 6ea8 or 6u8 type tube as in tv tuners.
I don't want to speak for someone else but for those who haven't watched Shango66 before; When he says he's not giving up, he means it. So look out for this miniature tube radio video soon 😊
*Hail* 🇺🇲 I second.
Maybe Not very soon but it will be working
Microscope is a great addition to your toolset. It can be a game changer. Mine was.
YAY You Can See Again Shango....
Enjoyed this video and the microscope too, that will sure be useful. I have a Petite SNY radio identical to that one. Thankfully, mine worked as soon as power was applied.
That microscope also has an HDMI output to go to a a different display like a TV or other monitor *or* what may be of benefit is that you can use an HDMI recording device of some sort (easy to find these days) connected to it.
I have both the electronic microscope you are reviewing and a binocular microscope. I prefer the binocular due to the 3-D effect and it seems more natural with hand-eye coordination.
Really nice microscope, Shango.
Outstanding. I can see using it for carburator rebuilds. The price certainly ain't bad.
I always enjoy when you get fancy new gear
Cool Shango, we can wait for the repair video!
Just for a few seconds there I thought Shango was going to use some compressed air to blow some of the crud out of the Petite radio before beginning diagnostics. Nope! Solid as a rock.
Shango has taken one small step towards Louis Rossman.
Rossmann
Awesome new Toy, _not for bath time,_ eat before use. Love Microscopes, they sure have have changed. Took pictures with camera thru eyepiece, videos if critters were moving. _got in trouble at work for it_ lol didn't stop me. *Tiny Life is grand,* govt., not so much.
Looking forward to the day. ... _define as needed._ *Cheers* 🇺🇲
A marvel of engineering.
Those tiny valves are super cool. Would love to see the radio worked on in a future video. Though I have to admit the wiring on the bottom looks like a nightmare. All the components looked to be wrapped around each other so where do you start.
Very cool Shango .
Cool. Looking forward to the next video. The video with the debate is the longest video I've ever watched. Did they give her something to help her speak?
lol kidding, right? re: "her"
What you may find handy for the microscope, is to find a telescopic arm to fit it to (like on a lamp, magnifier, microphone). That will let you more easily put stuff underneath it.
last weeks resurrection was awesome
The microscope is a nice piece of equipment but I wish it were cheaper. Years ago, I bought a digital microscope from China for about $20 that worked pretty decent but it runs only in Windows XP. I still have an old machine that it could run on. A couple of years ago, I bought a plain non-electronic handheld microscope that I have used to remove scratches from an lp record with a regular pin glued to a stick.
I'm very surprised that those miniature vacuum tubes weren't soldered in place.
I had wondered about that. One would think that tubes would be socketed, but even back then manufacturers tried to cut corners.
Looks very interesting!
Good stuff, shango!
Wow Shango found a new toy to play with and it is a great one. Game changer videos ahead. The made in Los Angeles Hoffman Radio model IP-402 called the Nugget from 1954 it has the same 4 subminiature tubes in it and modeled after
the Emerson 747. Their IF transformers couldn't get silver mica disease as the used tiny ceramic caps but corrosion in the
IF transformer wiring could be a real problem. Take it out and examining it with a microscope like this would be beneficial!
Can't find the service data on the nuggit doesn't appear anyone covered it
@@shango066 Since the Emerson model 747 is so similar to the Hoffman IP-402 have you compared
yours to the schematic and photos on line? Beitman's Vol 14, page 32 for the Emerson schematic. Got to say
with all those Meg sized resistors inside it must have been hard on the 1.5 Volt battery!
@@hestheMaster I scanned the sams for the Emerson And figured out how to test those tubes. So with the help here in the comments I'm getting ready. I'm sure it's an open coil.
Thanks! Really enjoyed this one!
1. Shango wearing gloves to unbox a brand new item?
2. Testing these tubes? Any tube testers? Show us!
3. Magnification? Of this "microscope." Cellular level?
This micro scope looks great I bought a small one a few years ago when my wife was still alive she was the one who bought it for me and I only got a 4 or 6 inch one because I don't want her to spin too much I'm going to get a binocular one or a 12 inch one
That microscope is cool, I bet you'll get a bunch of use from it.
$350 versus $20 USB Microscope. Of course the expensive version is a lot nicer, however the cheap generic version is still very usable and works well.
The only issue I had with mine was the base being in the way. I mounted it to an old heavy-duty clamp on lamp arm mount. Now, it can be moved to any location on the bench. The only issue is the fact that it is much less portable.
A great Microscope gonna work very nice
Lemme see if I still remember...
(-1-) Radio signal input is of VARIOUS frequencies so we TUNE an input tank circuit to a desired specific broadcast frequency.
(-2-) to achieve an intermediate frequency (fixed I.F.) we MIX that incoming RF with an oscillator. The oscillator frequency varies with input RF tuning such that the result is the FIXED I.F. The variable tuning capacitor has two segments: one for input RF and one for the oscillator.
(-3-) This I.F. mixing is done in a NON-LINEAR device that yields 4 frequencies: RF-in, Oscillator-in, sum of both, difference of both. Since these mixer outputs are selected/rejected by mixer ouput tank circuit only the DIFFERENCE is selected. This difference is the radio's FIXED I.F. frequency.
(-4-) This I.F. frequency contains amplitude varied signal varied at audio rates. To extract the audio the I.F. is routed thru a DETECTOR diode to yield positive-only audio as both positive and negative cancel. The result is voltage audio.
(-5-) As speakers require CURRENT to drive the magnets the audio voltage must be converted to audio current. This is the purpose of AUDIO OUTPUT stage. To convert voltage to current(power.)
(-6-) There's more but isn't this the basic operstion?
I heard, that soviet military tech used these kind of tubes well beyond the tube-era. As example the radios in the fighter planes were mentioned. Reason was, that the a-bomb fries the semiconductors. Well it fries the user to, but at least the radio survives. I don't know, if it's true or just an urban legend, but it kinda fits the cold-war mindset.
19:55 Motor boatin we go! 😁
❤❤شكرا جزيلا❤❤
The digital microscope is a nice tool, I have one. One issue is the more you zoom in the focus won't work well because the depth of field is great. It's better to zoom out more or use your hand held camera. Use the microscope only for very small items... Thanks for the video!
Nice
Nice shop assistant that microscope is.
11:15 Condenser or condensor? I've seen both.
I really don't understand why this radio was ever built. It was likely more expensive than a transistor radio and more expensive to run while probably not being any better.
20:28 radio noises 😁👍
Cool dude!
I use my microscope for checking coins and digging splinters out of my fingers! 👍
I’m curious what you did for audio… does the microscope have an audio input or did you dual-record on your normal camera to capture your commentary?
Dual
I think it's the same microscope Dave Jones of EEVblog reviewed in his latest Mailbag on 18 sep 2024.
You know it's serious when it has AF right in the model number.
Dear Shango 066 how much does that device cost you
Be careful ! It might have built in explosives ! LOL
Just breathing on that bare LCD will make a scratch
Digital microscopes are pretty eh for the price. Cheapest bi-ocular scope will run you about $200 and be better. Amscope SE400Z. I mounted it to a vesa monitor arm I got for $20 off marketplace. Got the idea from a few other people who mounted their digital scopes that way. Its well worth doing.
What country is the radio from?
I believe I saw, made in USA. Before hongkodial days....
That booklet thing had a good amount of chinglish in it, lol , but hey, hopefully this product will last a lot longer then the usual crud they make today
If you like chicken nuggets then you got to sing along if you like chicken nuggets then this is your favorite song 🎵
Hey shango wango, by any chance are you now at this stage in your life going through menopause....hummm.
Multitoads
What? Not edible...? Well what's the point then?
You're setting a very bad example by RTFMing first.
Zoomed in too close. Makes me go cross-eyed, gives me a headache, and gives me motion sickness. I hope all videos won’t be like this going forward.
We almost get to see who you are
I think the point of not showing his face in the videos isn’t an attempt to remain anonymous. Anyone doing a little digging will find several pictures of him online. I think the point is so that we have the visual perspective, like we’re working on the projects with him.
@@LiquidRadio Maybe
@@TKomoskidon’t be weird, bro
Hey Bonehead...new toy to play with huh....
Multumesc foarte interesant
Calling it a microscope is a bit of an exaggeration, but even with the low magnification it offers (compared to a real microscope). I think it is a great tool ideal for tracking down broken solder joints on boards or something like that. 🔎