12:19 . . . That is a monumental explanation for anyone learning about vacuum tubes and understanding the symbology used on schematics!! You are an awesome instructor, Shango.
Really awesome autopsy of the tube internals. Just wishing some great TH-camr like you were around 25 years ago when I started in the antique radio hobby! 😉
It did have good quality components in it for the day. Hardly anybody who didn't know about the repair of those sets would go reaching in there. I bet most were taken to the shop for repair? These were high tech equipment when new and expensive too. I'm saying this because of your comment on self servicing. You have such a talent for this resurrection repair. You troubleshooting process in all your videos are spot on. This example of the toasted transformer. I would of stopped right there. Maybe took it apart hoping to find the short? I think its your ability to stretch the limits of the components knowing what might be the results. I always tore into a bad part knowing there wasn't much to loose and learning from that experience. You have taken that to a new limit. Very entertaining and informative!
Interesting to see what goes around comes around... after the top of the AM dial being '1600' for decades, it went back to '1700' again. These 1930s and 1940s radios were built for the future!
Shangoo,Thanks for showing the inside of the tube. The vacuum tube is truly a modern miracle of technology. The tube chassis is extremely simple when compared to the transistor chassis.😊
Said so several times. US won't remember how to operate robust analog gear until something fails. The advanced technicians are thinning lot. I could disagree with his cultural views 51% while respecting him 100%. And they will ask mournfully, where did those folks go?
You and Bob are my two favorite TV / radio / misc. restoration channels on utube. Of course your your styles are different, each having your own sorts of goals, but I really appreciate and enjoy as well as learn something from both of you. Thanks for sharing. The perpetual energy, free energy people on the youtube can be very entertaining. Some of them even dupe greedy people into investing in their projects. That nutter that worked on the water powered dune buggy comes to mind. I think that's what made him very sick. Making those promises to his investors that he could never keep.. I have enjoyed commenting on their channels. Some have invested a lot of time in their projects and build some very beautiful machines. I've always recommended that they could read a high school level physics book and learned that it can't work, but some people don't believe things they cannot test for themselves, so it's all good. I laugh at the ones that think that if they refine the project a little more it will start working so some keep at it endlessly chasing the rainbow to try and grab the pot of gold at it's end. For what it's worth we're all tired of paying for energy, and even more as the costs are going up. I admire the human spirit that yearns for freedom from the slavery of the treadmill we're on.
That was excellent. Great description of all the internal components. Amazing these were able to be designed and function without the aid of any type of computer... just ingenuity.
Messaging from Australia here, so weird to hear 60hz mains hum instead of 50hz, love your videos Shango, great stuff, troubleshooting to the component level is what it is all about.
I used to work for Raytheon that owned DuMont Power Tube Division located in Waltham, MA that was in business of making electronics components for military and commercial until it shut down and fired over than 5000 employee including plant manager in 1992. I tour the plant back in 1990 when the set up for production that look like 1920 time tunnal where there is a production worker and solder set on the station while supevisor set on the raise floor looking at worker. We went for job conference to look for work after we were fired and trying to present the credential of the technology that no longer exists.
Audio transformer is probably open but I was diagnosing an old battery farm set and found that the transformer windings were good after tracking an open input on said transformer. I was going to have to replace it so was going to make dang sure it was indeed junk. I carefully unwrapped the paper, "unsoldered" the winding leads off the cable leads and checked them for continuity. They worked. I had been real thorough in tracking continuity through all aspects of this open transformer so have assumed that somehow the transformer windings weren't actually soldered to the incoming cable leads - they were coiled around them and did work for a while. The cable leads were tinned but the transformer windings did appear all copper colored. Sitting since the 40's and viola it no longer worked. Someone had also done some work in this area over the years - audio tube socket replaced, cap replaced, and possibly power switch/ volume replaced. All that trouble caused by a factory defect.
Your presentation of the pieces of that tube inspired the thought: Imagine thinking you can manufacture such an intricate thing in quantity. It looks as if maybe one in a hundred might work…
I think that's where you don't wait for system wide testing. Where gaps in microns make break, the station could have before after templates to quick check sub parts. Manufacturing was quite scientific by the 1930s.
Wow ! Another amazing video from Shango066…. Now my Saturday is happy and complete… great bodge work , adaptation and improvisation… by the end of the video I almost expected you to tell Igor to pull the chain down, bringing the creature down from the roof where the lightning rod was, after the lightning strike… listening…. Yes, we have a heartbeat… yes! Yes! It’s alive, it lives again!!! ..”Ahh sweet mystery of life, at last I’ve found you”( young Frankenstein reference)
the power factor is 1 bc theres shorted turns in the transformer so its like theres another winding with a resistor across it (the resistance of the wire)
Wow!!! Amazing improvisation, adaptation and needed bodge work to bring that radio back to some kinda life, Shango066…. I almost expected you to get Igor, your faithful assistant to pull on the chain, thus bringing the radio back down from the roof of your castle where a lightning rod was and after a powerful lightning strike, you’d listen and say “it’s alive”… nice dissection of the tube as well… the 1938 Fronk-en-radio has been brought back from the dead… a new Shango066 video, this is gonna be good… and now my weekend is complete…
My grandpa used to work on perpetual motion inventions. While he never found the secret; he did have some really neat devices in his workshop. His farm was like the one I grew up on, no electrical power so his machines usually were started by 6 volt lead acid batteries. One that ran the longest was a motor hooked to a generator started by that battery, it ran for nearly 3 days before dying.
Need a weekend with Shango great video and nice to see how to get some trash working again, Learn a lot and so encouraging to watch as I restore radios. Love to watch and learn my favorite channel. Thanks Shango
I found out that ONLY a Spark Plug made in Germany from 1987-1993 will work. Apparently they installed inside the spark plug a miniature Flux Capacitor, and that does the trick... I have 4 of them in parallel with my AC power into my fuse panel, and my electric bill last month was only $37.00 ,, Works great, but you let out the secret now!!! 🙂
It always amazed me since I was a young kid when I used to tear old tubes apart that they could make those tubes with such precision in the 20's 30's and 40's with what they had to work with.
WIth how big those old rectifier tubes are, I think one could fit an entire replacement switching mode power supply in a tube form factor, capable of supplying those 50-60W. I experimented with some simple resonant power supplies and it's just interesting how simple it can get. You can make a dead simple constant ratio (vin*ratio=vout, apart from resistance/leakage inductance drops under load) resonant power supply, working slightly under the resonant frequency, with some minor air gap to obtain ZVS operation. At work we managed to get 100-ish W out of a small ETD29 core when testing out possible options for a certain project. I'm still trying to make a bigger version which can supply 200+W for a big amp, high output voltages are making it a lot easier, as the wires can be thin and synchronous rectifiers are pretty much not needed.
@@blitzroehre1807 A properly designed one shouldn't, especially one that is using ZVS which is also called "soft switching" greatly reducing interference as there is no "forced" voltage change in the circuit which produces a lot of harmonics. The changes are also a bit slower.
Yes but the switching noise would be horrendous and zap all the radio station signals. You are switching several watts and the radio signals are like a billionth of that. No way to shield that without using a metal can shield and several Pi-style filters on every lead. Car radios had switching power supplies using a vibrator. They had extensive shielding and you could still hear the vibrator buzz on weak stations.
28:00 Cut the lead to the shorted secondary half. 54:04 😂 37:32 It's old enough to smoke.... I've been thinking about my thought to cut the lower voltage shorted half of the full wave center tapped B+ secondary winding. The rectifier would prevent the shorted lower voltage from loading the other half... Correct? Cutting that lead would not substantially change the resulting B+ which I'm guessing should be 400 volts or in the vicinity... Nice work. I always learn something. You've taught me so much since I've been watching your videos maybe a decade now. Thank-you so much!
If it's a shorted winding, there's nothing you can do. It will cause excessive current regardless of if it's connected or not. If a single winding in the B+ is shorted to ground, you might be able to do something by disconnecting the grounded center tap.
Oh yeah! shango ah boa noite! ah okay shango, olha velho amigo, você é um ótimo técnico,, você acabou consertando um Radio antigo,, é por isso que adoro os seus vídeos Oh yeah! shango oh good night! ah okay shango, look old friend, you're a great technician, you ended up repairing an old radio, that's why I love your videos
Plenty of signal electronics fundamentals to learn during this brisk resurrection. More conductance makes inductance and that was demonstrated from the hum off all that rigging. Modernity has made human origin RF a ubiquitous force field. From just this video understanding importance of design compactness and shielding may be anticipated.
That was really awesome the way you got that radio working I like old radios are great it seems like it's a real fixer-upper Anna performs real good too way better than the damn radios made today keep up the good work man
So if I’m hearing you correctly what you’re saying is you would replace 98% of the radio with new parts to make it work properly in which case you’ve got a brand new 21st century radio…. I would resurrect it fix the box grind off the rivets, install the newer transformer, etc. make it shine again now that would be both personally satisfying and cool to see a 1930’s radio restored to its former glory😊😊🇨🇦👍
Now, I see why most consumer sets didn't have a line fuse back then. The total failure of the power transformer wasn't always immediate and the set would continue playing, albeit with lower performance. The owner would notice the smell and unplug it from the wall. It was still a fire hazard as other failure modes probably resulted in some instant fireworks. How much did a fuse and fuse holder cost back then? It couldn't have a been more than a few pennies....
I really liked how you took apart the vacuum tube and explained all the parts and failure points. Try doing that with integrated microchips!!! That's the advantage of vacuum tubes you can relatively easily remove the glass and look at every part of that tube....there is nothing hidden. ...an IC....well my friend....they can play all sorts of games.... hide all sorts of surveillance devices and it will be difficult to locate them...and nearly impossible to remove without destroying the IC There is one guy, that I know of, on TH-cam that makes homemade vacuum tubes using different types of wire, spot welders, a hot flame, and glass tubes. No funny business there.
I used to work and smoke at the same time. When I quit working, I quit smoking. Neither of my sisters quit smoking, both are now buried up on the hill south of town.
Do you need some 6Q7's? I have a bunch that work but are a bit weak. I have had a lot of luck with getting basket case radios for nothing. I will spend 2 weeks glueing delaminated plywood and clamping, then sanding, staining and making it a working radio.
Greetings: Wait! The schematic for the 1N1238 shows nothing except two diodes inside. No heater replacement, and no resistor to account for the lack of voltage drop between cathode and plate. As the tube is usually alone in using the 5v heater winding, the remaining concern is the higher B+ voltage. Since you have a usable vacuum tube rectifier, you can measure the B+ once the rest of the electrical restoration is done. BTW: I would use the unused 5v winding to reduce the incoming mains voltage that in now higher than it was back in the '30s. Do not forget to disconnect the B+ lead from the filament winding if you do that. After you determine the needed voltage drop, I would not use the 1N1238 tube, but instead use another tube socket and use a pair of 1N4007 diodes and the needed dropping resistor to make your own with the dropping resistor in series with the two cathodes to pin-8. I would like to replace that resistor with a capacitor but don't have the experience to justify that experiment. If you choose to use a tuning eye tube, I would use a Reed relay to disconnect the target voltage when not actually tuning (a 555 timer is called for, trigger with any reliable voltage change such as an op amp that detects. A sudden change in AVC level.) Reed relays can handle the HT DC target voltage. Be aware that the speaker field coil is in the B- circuit from the power transformer center tap that supplies various bias voltages for grids.
No matter how bad the vintage piece of electronic equipment whether it be a TV or radio or whatever Shango will get it to work don't buy the whole rusted crusted destroyed whatever you will get it to work
That really sounds good on all of its original parts And I'll bet that when that transformer started making that smell that's probably why the people pitched it
Excellent video! It's a good thing Shango disconnected that power transformer when he did. The odor of what is probably polychlorinated biphenyls is likely what Shango is smelling from the smoke. PCB's were banned in 1979 because they were carcinogenic; determined as having caused cancer of the liver and biliary tract.
GREAT 😊 Montgomery Ward’s AM/FM radio 📻!! I would have guessed it to be a Sears, or Western Auto model. Some brand new finish, and a grille cloth, will fix this puppy 🐶 all 🆙. Your friend, Jeff.
6Q7 has a Mu factor of 70. 6SQ7 has a Mu factor of 100. Except for the grid cap, and that they are identical. Does the higher gain make a difference? Maybe in the bias, but the circuit is usually biased by contact bias with a high resistance grid resistor and isn't critical. So the tube sub will be fine. BTW the 12AT6 and 12AV6 are the same idea, the former being a slightly lower gain tube.
Yeah switches have a minimum switching voltage and also current, if the voltage is below this the switch will quickly build up corrosion and the voltage wont be high enough to break trough it and the switch will fail. That's why you shouldn't use mains switches for low voltage.
You see this a lot with incandescent series string Christmas lights. If you ohm out the string, it appears open, but apply mains power and they light up. Measure again and now you have a normal resistance measurement.
each function section is basically a collection of nested circles around a common center when viewed from the top.. heater, cathode (can be one wire doing both jobs) surrounded by up to 3 coils of wire, the grid, the screen and the suspressor and all of the surrounded by an outer shell called the plate....making, in order of the number of surrounding coils: 0 coils a diode, 1- a triode, 2- tetrode, 3-a pentode....so a pentode can have from the center out: a heater, a cathode, a grid, a screen , a susppressor and the plate....good far?....in some designs, the wires supporting the internal coils effect the flow of electrons...so take the nested circles and instead make them nested rectangles and between the two arrangements you have the physical layout of most low power vacuum tubes.... for multi function (dual diode, dual triode, dual diode and triode) tubes the functions are arranged side by side or stacked or both...
That grid suppression stuff would be interesting to discuss from PoV applications in vintage gear or high frequency what? I've been surprised how seldom I've seen the RCA Zenith platforms using that in these videos.
@@directcurrent5751 power pentodes in vacuum tube variable speed machinery....i have seen some that were used in lathes and chuckers made by, i believe, Hardinge, that were huge...like 9" tall and almost 4" in diameter... edit....tried google and turns out most common use is in audio amplification....
If you want some cheap caps to replace those in resurrection try out the capacitor pack from electronic goldmine out of Arizona. They sell boxes of misc caps of all sizes, most are high quality but you have to do the sorting yourself. IT will give you a wonderful assortment for a low price. I get a box about once every couple of years. Cheap and great quality but the sort is yours.
5y3 can be replaced with 2 silicon diodes and a 400ohm resistor in the cathode/heater. 200ohm for 5u4. You save 10 watts of power. eachDiode leg is better with 2 diodes in series for greater PIV. Have repaired worse radios. Its a good radio, NOT JUNK.
There's nothing better for the weekend than a video from Shangoo.
Shango can make totally roached out radios left for dead, play ! Been watching for years . Still as entertaining as the first ones ..
bottle of jack and visit from a hooker.
12:19 . . . That is a monumental explanation for anyone learning about vacuum tubes and understanding the symbology used on schematics!! You are an awesome instructor, Shango.
Quite.
Nominated as an ideal 101 course for new learners.
Nominated as an ideal 101 course for new learners.
I'm like a kindergartener in the field and I couldn't have put it better than that. He is genius!
I have never seen such an interesting autopsy of a tube before, congratulations for the whole job
Technology that took us to the moon.
@@Phantom-darknessnot even close. In the apollo13 they even used ICs.
The only time I seen better autopsies on tubes than Shangos is when I made them myself on my own tubes ha ha
Really awesome autopsy of the tube internals. Just wishing some great TH-camr like you were around 25 years ago when I started in the antique radio hobby! 😉
It did have good quality components in it for the day. Hardly anybody who didn't know about the repair of those sets would go reaching in there. I bet most were taken to the shop for repair? These were high tech equipment when new and expensive too. I'm saying this because of your comment on self servicing. You have such a talent for this resurrection repair. You troubleshooting process in all your videos are spot on. This example of the toasted transformer. I would of stopped right there. Maybe took it apart hoping to find the short? I think its your ability to stretch the limits of the components knowing what might be the results.
I always tore into a bad part knowing there wasn't much to loose and learning from that experience. You have taken that to a new limit.
Very entertaining and informative!
Interesting to see what goes around comes around... after the top of the AM dial being '1600' for decades, it went back to '1700' again. These 1930s and 1940s radios were built for the future!
The frequency range extended that high to cover the old Police band. Once those services were relocated, the top end went back to 1605 kc again...
Shangoo,Thanks for showing the inside of the tube. The vacuum tube is truly a modern miracle of technology. The tube chassis is extremely simple when compared to the transistor chassis.😊
we tend to not think about the brilliance of earlier generations of engineers and manufacturers
How about, I was 1 year old when that model was released. I am in about that condition also. All the levers are stuck.
This man is a national treasure.
Said so several times. US won't remember how to operate robust analog gear until something fails. The advanced technicians are thinning lot. I could disagree with his cultural views 51% while respecting him 100%. And they will ask mournfully, where did those folks go?
@@directcurrent5751Shut Up!!!!! Communist Pig!!!!!
what a beautiful radio. I have never seen one in such pristine condition before
I got a 1940s Wards with good transformers going good enough to listen to for all my high-school years. Thanks for not giving up on this one.
You and Bob are my two favorite TV / radio / misc. restoration channels on utube. Of course your your styles are different, each having your own sorts of goals, but I really appreciate and enjoy as well as learn something from both of you.
Thanks for sharing.
The perpetual energy, free energy people on the youtube can be very entertaining. Some of them even dupe greedy people into investing in their projects. That nutter that worked on the water powered dune buggy comes to mind. I think that's what made him very sick. Making those promises to his investors that he could never keep..
I have enjoyed commenting on their channels. Some have invested a lot of time in their projects and build some very beautiful machines. I've always recommended that they could read a high school level physics book and learned that it can't work, but some people don't believe things they cannot test for themselves, so it's all good. I laugh at the ones that think that if they refine the project a little more it will start working so some keep at it endlessly chasing the rainbow to try and grab the pot of gold at it's end. For what it's worth we're all tired of paying for energy, and even more as the costs are going up. I admire the human spirit that yearns for freedom from the slavery of the treadmill we're on.
What is the name of Bobs YT channel?
Thanks for diving into the donor tube. First time I've seen anyone break it down like this having seen many videos.
That was excellent. Great description of all the internal components. Amazing these were able to be designed and function without the aid of any type of computer... just ingenuity.
I’m very impressed to see vintage tube radio like that man. thanks
Messaging from Australia here, so weird to hear 60hz mains hum instead of 50hz, love your videos Shango, great stuff, troubleshooting to the component level is what it is all about.
I used to work for Raytheon that owned DuMont Power Tube Division located in Waltham, MA that was in business of making electronics components for military and commercial until it shut down and fired over than 5000 employee including plant manager in 1992. I tour the plant back in 1990 when the set up for production that look like 1920 time tunnal where there is a production worker and solder set on the station while supevisor set on the raise floor looking at worker. We went for job conference to look for work after we were fired and trying to present the credential of the technology that no longer exists.
Only shangoo could do his unique form of ressurection on something with burnt out transformers and still get Frankenradio to work.
Audio transformer is probably open but I was diagnosing an old battery farm set and found that the transformer windings were good after tracking an open input on said transformer. I was going to have to replace it so was going to make dang sure it was indeed junk. I carefully unwrapped the paper, "unsoldered" the winding leads off the cable leads and checked them for continuity. They worked. I had been real thorough in tracking continuity through all aspects of this open transformer so have assumed that somehow the transformer windings weren't actually soldered to the incoming cable leads - they were coiled around them and did work for a while. The cable leads were tinned but the transformer windings did appear all copper colored. Sitting since the 40's and viola it no longer worked. Someone had also done some work in this area over the years - audio tube socket replaced, cap replaced, and possibly power switch/ volume replaced. All that trouble caused by a factory defect.
Your presentation of the pieces of that tube inspired the thought: Imagine thinking you can manufacture such an intricate thing in quantity. It looks as if maybe one in a hundred might work…
I think that's where you don't wait for system wide testing. Where gaps in microns make break, the station could have before after templates to quick check sub parts. Manufacturing was quite scientific by the 1930s.
Wow ! Another amazing video from Shango066…. Now my Saturday is happy and complete… great bodge work , adaptation and improvisation… by the end of the video I almost expected you to tell Igor to pull the chain down, bringing the creature down from the roof where the lightning rod was, after the lightning strike… listening…. Yes, we have a heartbeat… yes! Yes! It’s alive, it lives again!!! ..”Ahh sweet mystery of life, at last I’ve found you”( young Frankenstein reference)
Yay! A resurrection!
My folks were kids when that radio came out.
Nice video! This radio is about as old as my grandpa! He's 86 years old and luckily still well!
the power factor is 1 bc theres shorted turns in the transformer so its like theres another winding with a resistor across it (the resistance of the wire)
I love these restoration videos.
wow...i can't believe you got recognizable audio out of that train wreck so quickly...
The post-mortem exam on the tube was very instructive. Thank you.
Wow!!! Amazing improvisation, adaptation and needed bodge work to bring that radio back to some kinda life, Shango066…. I almost expected you to get Igor, your faithful assistant to pull on the chain, thus bringing the radio back down from the roof of your castle where a lightning rod was and after a powerful lightning strike, you’d listen and say “it’s alive”… nice dissection of the tube as well… the 1938 Fronk-en-radio has been brought back from the dead… a new Shango066 video, this is gonna be good… and now my weekend is complete…
I Love the radio videos, let's go!
so do i love the real older radios
My grandpa used to work on perpetual motion inventions. While he never found the secret; he did have some really neat devices in his workshop. His farm was like the one I grew up on, no electrical power so his machines usually were started by 6 volt lead acid batteries. One that ran the longest was a motor hooked to a generator started by that battery, it ran for nearly 3 days before dying.
Need a weekend with Shango great video and nice to see how to get some trash working again, Learn a lot and so encouraging to watch as I restore radios. Love to watch and learn my favorite channel. Thanks Shango
I found out that ONLY a Spark Plug made in Germany from 1987-1993 will work. Apparently they installed inside the spark plug a miniature Flux Capacitor, and that does the trick... I have 4 of them in parallel with my AC power into my fuse panel, and my electric bill last month was only $37.00 ,, Works great, but you let out the secret now!!! 🙂
It always amazed me since I was a young kid when I used to tear old tubes apart that they could make those tubes with such precision in the 20's 30's and 40's with what they had to work with.
Hand crafted. Same profile as seen today in medical device manufacturing: mostly women and all them smarter than basic laborers.
Awesome video!
Thanks for showing how the tube works. 🙏❤️
Quality radio in it's day, you got this Shangoo
I Had some nasty Radios too, but Nothing getting Close to THIS. Wouldn't even try to fix it, so Respect man!
0:20:40 welcomes the return of a loyal friend of the channel. seems to appear quite often in this library. RIP friend
I like the look of the replacement 5Y3. Matches the style of the radio.
Opening up the tube and going through it was very cool
We know you couldn't made us all as state replacement but what is the fun in that shango LOL smile
Top Vid Shango ! Loved the Tube cut down. Keep em up Mate !
Cheers, Baz
Saturday morning Shango show!
I love these resurrection videos!
Nice. I'm working on a 1929 Victor RE-75 while listening to this. Got a wicked hum I've been fighting for 3 days.
Thanks for the tube dissection and explanation.
I think you should completely restore it. You are almost there now.😊
Another great resurrection video, that I enjoyed wathching, thank you mr. Shango066 for sharing
WIth how big those old rectifier tubes are, I think one could fit an entire replacement switching mode power supply in a tube form factor, capable of supplying those 50-60W. I experimented with some simple resonant power supplies and it's just interesting how simple it can get. You can make a dead simple constant ratio (vin*ratio=vout, apart from resistance/leakage inductance drops under load) resonant power supply, working slightly under the resonant frequency, with some minor air gap to obtain ZVS operation. At work we managed to get 100-ish W out of a small ETD29 core when testing out possible options for a certain project. I'm still trying to make a bigger version which can supply 200+W for a big amp, high output voltages are making it a lot easier, as the wires can be thin and synchronous rectifiers are pretty much not needed.
Switchmode PS will completely buzz out AM reception
@@blitzroehre1807 A properly designed one shouldn't, especially one that is using ZVS which is also called "soft switching" greatly reducing interference as there is no "forced" voltage change in the circuit which produces a lot of harmonics. The changes are also a bit slower.
Yes but the switching noise would be horrendous and zap all the radio station signals. You are switching several watts and the radio signals are like a billionth of that. No way to shield that without using a metal can shield and several Pi-style filters on every lead. Car radios had switching power supplies using a vibrator. They had extensive shielding and you could still hear the vibrator buzz on weak stations.
28:00 Cut the lead to the shorted secondary half.
54:04 😂
37:32 It's old enough to smoke....
I've been thinking about my thought to cut the lower voltage shorted half of the full wave center tapped B+ secondary winding. The rectifier would prevent the shorted lower voltage from loading the other half... Correct? Cutting that lead would not substantially change the resulting B+ which I'm guessing should be 400 volts or in the vicinity...
Nice work. I always learn something. You've taught me so much since I've been watching your videos maybe a decade now. Thank-you so much!
If it's a shorted winding, there's nothing you can do. It will cause excessive current regardless of if it's connected or not. If a single winding in the B+ is shorted to ground, you might be able to do something by disconnecting the grounded center tap.
I can smell that radio all the way up here in Canada
Oh yeah! shango ah boa noite! ah okay shango, olha velho amigo, você é um ótimo técnico,, você acabou consertando um Radio antigo,, é por isso que adoro os seus vídeos
Oh yeah! shango oh good night! ah okay shango, look old friend, you're a great technician, you ended up repairing an old radio, that's why I love your videos
Insane you got sound out of that thing. I was expecting it to blow as soon as the bypass was hit
I was expecting an Electroboom moment. I'm surprised it worked as well as it did.
the traditional petrified spider and smokie transformer flavor country ! I love this !!
You are very talented with radio and Television from John
Plenty of signal electronics fundamentals to learn during this brisk resurrection. More conductance makes inductance and that was demonstrated from the hum off all that rigging. Modernity has made human origin RF a ubiquitous force field. From just this video understanding importance of design compactness and shielding may be anticipated.
Great job on that one. With some time and patience you could make an old crusty Rusty piece of trash work again very admirable
Excellent video, Shango.
That was really awesome the way you got that radio working I like old radios are great it seems like it's a real fixer-upper Anna performs real good too way better than the damn radios made today keep up the good work man
So if I’m hearing you correctly what you’re saying is you would replace 98% of the radio with new parts to make it work properly in which case you’ve got a brand new 21st century radio…. I would resurrect it fix the box grind off the rivets, install the newer transformer, etc. make it shine again now that would be both personally satisfying and cool to see a 1930’s radio restored to its former glory😊😊🇨🇦👍
This reminds me of the old Star Trek episode where Spock made a communication device out of early 20th Century radio parts & old vacuum tubes!
Now, I see why most consumer sets didn't have a line fuse back then. The total failure of the power transformer wasn't always immediate and the set would continue playing, albeit with lower performance. The owner would notice the smell and unplug it from the wall. It was still a fire hazard as other failure modes probably resulted in some instant fireworks. How much did a fuse and fuse holder cost back then? It couldn't have a been more than a few pennies....
I really liked how you took apart the vacuum tube and explained all the parts and failure points.
Try doing that with integrated microchips!!!
That's the advantage of vacuum tubes you can relatively easily remove the glass and look at every part of that tube....there is nothing hidden.
...an IC....well my friend....they can play all sorts of games.... hide all sorts of surveillance devices and it will be difficult to locate them...and nearly impossible to remove without destroying the IC
There is one guy, that I know of, on TH-cam that makes homemade vacuum tubes using different types of wire, spot welders, a hot flame, and glass tubes. No funny business there.
13:19 6Q7 adapter is happy to see service!
Looks like a shelf queen to me! A little duct tape on that cabinet and it's ready for use as a daily driver.
Also maybe some Howard's Restore A Finish.
Love this guy
I used to work and smoke at the same time. When I quit working, I quit smoking. Neither of my sisters quit smoking, both are now buried up on the hill south of town.
awesome stuff ive liked for the commercial brake love all your stuff dude since 2011😂❤
Do you need some 6Q7's? I have a bunch that work but are a bit weak. I have had a lot of luck with getting basket case radios for nothing. I will spend 2 weeks glueing delaminated plywood and clamping, then sanding, staining and making it a working radio.
Built 1938 what a great find!
Greetings:
Wait! The schematic for the 1N1238 shows nothing except two diodes inside. No heater replacement, and no resistor to account for the lack of voltage drop between cathode and plate. As the tube is usually alone in using the 5v heater winding, the remaining concern is the higher B+ voltage. Since you have a usable vacuum tube rectifier, you can measure the B+ once the rest of the electrical restoration is done.
BTW: I would use the unused 5v winding to reduce the incoming mains voltage that in now higher than it was back in the '30s. Do not forget to disconnect the B+ lead from the filament winding if you do that.
After you determine the needed voltage drop, I would not use the 1N1238 tube, but instead use another tube socket and use a pair of 1N4007 diodes and the needed dropping resistor to make your own with the dropping resistor in series with the two cathodes to pin-8. I would like to replace that resistor with a capacitor but don't have the experience to justify that experiment.
If you choose to use a tuning eye tube, I would use a Reed relay to disconnect the target voltage when not actually tuning (a 555 timer is called for, trigger with any reliable voltage change such as an op amp that detects. A sudden change in AVC level.) Reed relays can handle the HT DC target voltage.
Be aware that the speaker field coil is in the B- circuit from the power transformer center tap that supplies various bias voltages for grids.
No matter how bad the vintage piece of electronic equipment whether it be a TV or radio or whatever Shango will get it to work don't buy the whole rusted crusted destroyed whatever you will get it to work
"Radio's not supposed to be like this". This is some great entertainment this is.
I can almost smell that transformer just by watching.
That really sounds good on all of its original parts
And I'll bet that when that transformer started making that smell that's probably why the people pitched it
32:00 “shadows, no more than shadows is the tremor of my voice, I could have been happy..” that’s what it says
Excellent video! It's a good thing Shango disconnected that power transformer when he did. The odor of what is probably polychlorinated biphenyls is likely what Shango is smelling from the smoke. PCB's were banned in 1979 because they were carcinogenic; determined as having caused cancer of the liver and biliary tract.
Not likely in that old transformer
@@jonathaneastwood2927 Let's hope this is the case.
PCB's were not used in small transformers, only in kilowatt and larger ones. It was too expensive for use in consumer radios. FOrtunately.
PCB’s were a liquid used as a fireproof agent instead of transformer oil.
I would be very careful about putting voltage into an unknown set with a dead spider in it, could cause reanimation.
GREAT 😊 Montgomery Ward’s AM/FM radio 📻!! I would have guessed it to be a Sears, or Western Auto model. Some brand new finish, and a grille cloth, will fix this puppy 🐶 all 🆙. Your friend, Jeff.
Shango can take an old junk table radio from the 30's and make it sing again. Good job! 😉
Thank you very much.
6Q7 has a Mu factor of 70. 6SQ7 has a Mu factor of 100. Except for the grid cap, and that they are identical. Does the higher gain make a difference? Maybe in the bias, but the circuit is usually biased by contact bias with a high resistance grid resistor and isn't critical. So the tube sub will be fine. BTW the 12AT6 and 12AV6 are the same idea, the former being a slightly lower gain tube.
Impressive work... but of course you already know that. That radio is a year older than my mom.
Also see Mr. Radio, Radiorama, from the Radio Museum, would be a great resource... Cheers
It's working but it's smoking at the same time. I would expect nothing different from something dating back to the late 30s.
Back then, everybody smoked.
Yeah switches have a minimum switching voltage and also current, if the voltage is below this the switch will quickly build up corrosion and the voltage wont be high enough to break trough it and the switch will fail.
That's why you shouldn't use mains switches for low voltage.
You see this a lot with incandescent series string Christmas lights. If you ohm out the string, it appears open, but apply mains power and they light up. Measure again and now you have a normal resistance measurement.
Free energy radio power generator for your whole neighborhood! Looks like the secret is a shorted power transformer.
13:35 That Silicon Rectifier was made in my hometown!
I think they make a somewhat convincing drop-in LED replacement for magic eyes.
there was a couple
...still plenty eye tubes around, no real need to build a replacement
@@blitzroehre1807 very high price though, especially the 'round' end viewed types,
Please dissect some more complex tubes like pentodes and such. I don't really understand the working of other grids, screens etc.
each function section is basically a collection of nested circles around a common center when viewed from the top.. heater, cathode (can be one wire doing both jobs) surrounded by up to 3 coils of wire, the grid, the screen and the suspressor and all of the surrounded by an outer shell called the plate....making, in order of the number of surrounding coils: 0 coils a diode, 1- a triode, 2- tetrode, 3-a pentode....so a pentode can have from the center out: a heater, a cathode, a grid, a screen , a susppressor and the plate....good far?....in some designs, the wires supporting the internal coils effect the flow of electrons...so take the nested circles and instead make them nested rectangles and between the two arrangements you have the physical layout of most low power vacuum tubes....
for multi function (dual diode, dual triode, dual diode and triode) tubes the functions are arranged side by side or stacked or both...
Sometimes the other grids are tied to either cathode or plate. Which doesn't make sense to me.@@CATech1138
That grid suppression stuff would be interesting to discuss from PoV applications in vintage gear or high frequency what? I've been surprised how seldom I've seen the RCA Zenith platforms using that in these videos.
@@directcurrent5751 power pentodes in vacuum tube variable speed machinery....i have seen some that were used in lathes and chuckers made by, i believe, Hardinge, that were huge...like 9" tall and almost 4" in diameter...
edit....tried google and turns out most common use is in audio amplification....
wow amkazing ressurection here! shortwave band is a plus!!!!☝👍👍👍
2 bad transformers, no tubes and a broken cabinet. If that radio was a cat it would answer to the name Lucky! Great video as always shango.
That's in perfect condition 😀.
RadioTVPhonoNut has an awesome channel too, pretty sharp dude.
I am missing the shango mumble rap.. I want more of it.. Its funny af
If you want some cheap caps to replace those in resurrection try out the capacitor pack from electronic goldmine out of Arizona. They sell boxes of misc caps of all sizes, most are high quality but you have to do the sorting yourself. IT will give you a wonderful assortment for a low price. I get a box about once every couple of years. Cheap and great quality but the sort is yours.
Add a tuning eye tube to the sparkplug and you'll get your daily fortune AND perpetual energy ✨️
Another great presentation. I think old electronics are so heavy is due to Unobtanium having such a high atomic weight.
5y3 can be replaced with 2 silicon diodes and a 400ohm resistor in the cathode/heater. 200ohm for 5u4. You save 10 watts of power. eachDiode leg is better with 2 diodes in series for greater PIV. Have repaired worse radios. Its a good radio, NOT JUNK.
Say yes to smoke even the radio goes through two packs a day
Love your works
This one looks good.
Very cool old radio❤