Estes radio alemães desta epoca são realmente muito bem construidos , eletricamente e mecanicamente. Gostamos muito quando voce trabalha com estes radio valvulados !!! Vamos aguardar os proximos capitulos. Saudações ao povo da ilha da Madeira !!!!! São Paulo - Brasil
David Tipton goes way above & beyond in his restoration. But you do a very good restoration as well! I always give you a thumbs-Up before you even start a project, since I know you'll do an excellent job!
Back to basics and I like it. You have taught me a lot by doing the solid state units but I love these tube sets, this is a nice little radio. I'm anxious to see what you find wrong. Thanks for the shout out. Cheers!
The shout-out in this case is very well deserved. I believe that this community is quite small, and we always like to find new creators to feed our addiction 😃
Hello. Always enjoy your videos and you always end up with great results. I saw the David Tipton video and he did an amazing job with the cabinet. I am also very confident that you will achieve a great result as well. Can't wait for the next video. Keep up the good work. Chris.
Lovely little set. The special chocolate block connecter made it so much more errr.... fun to look at!. I was surprised you didn't throw a signal up the gram input though. Never mind, it will come to life pretty soon I'm guessing
This is where a signal tracer could come handy :) I had the same symptoms and used an amplified speaker for the purpose, and this let me realise that the audio stage was out but the radio was fine. Unfortunately, it was the output transformer that was fried and like this one, it had a special primary tap where B+ is injected. Had to use a standard transformer for the output tube and inject B+ through a resistor to the top of the original transformer connection.
I love those old German radios. Have about 6. Hopefully I will learn enough to get them working. The multi cap caps confused me at first. Figured that out.
You're starting to do troubleshooting like me.. Quick n easy! I'm betting it's the audio section. Hopefully not the output transformer.. Bonne chance!!
It’s tabaco sunburst on the case, and tabaco residue on the chassis :) I play both guitars more regularly than well :) they are both Lag. One is the tramontane and the electric is the imperator. I like them.
@@electronicsoldandnew great job and love your channel when in Las palmas last i saw 2 tube radios in junk store off l playa de las canteras near auditorio Alfredo kraus
Part of the output transformer windings is used as the power supply choke! I had often thought of this idea and wondered why it wasn't used in practice. It's very exciting finally to see an actual implementation! I bet the ceramic mains plug is a retro-fit. Given this is an FM era radio, it's not what I would expect to find at the end of the mains lead. Either a plastic or a bakelite plug would be the norm, I reckon. Plus, the ceramic plug shouldn't have survived this long. It looks to be brand new so maybe it was recently acquired? Interesting find anyway. One thing I wanted to ask you is how you tackle rust in the transformer laminations. Spraying with WD40 or other rust removal substance is something I'd never do as it would penetrate through the laminations and potentially contaminate the paper. What I sometimes resort to is rubbing with aluminium foil but that is not ideal because a) it's a temporary fix and b) bits of aluminium get everywhere if you're not careful - not at all a good thing. The proper thing would be to sand it down and paint over with a primer and then paint but I don't want to lose the patina.
It’s a great plug, but definitely did not come from the factory. I’ll be going through the schematic in some detail, as I’ve also found a few quirks that may interest somebody. The choke idea is used in many German radios, and certainly has a great effect on hum reduction.
@@electronicsoldandnew I wonder why tube amp makers don't use the same idea. You often see loudspeaker field-coils used as the PS choke so my ultimate fantasy implementation of the idea would be a combined field-coil, choke and output transformer! Now that would be something to witness happening! Practicalities aside, the only downside I see with the ceramic mains plug is that you then have to retro-fit your house with ceramic mains sockets and light switches to match! ;)
On my 4192 had the same problem on you're radio tone on my radio it's balance ..Ican't see away to clean the Volume /balance control how do I get some Deoxitin it ? Still have thay hum with my radio tuning and volume have no effect on the hum recap resistance checking..Only the Selinium rectifier hasn't been changed B+ is fine..So very hot transformer and hum.. Radio not happy.. I find your videos very intetaining your a True Craftsman with these radios..Best regards,
Why didn't you switch it to pickup and check that the audio amp is working (very loud hum when touching the input with your finger or use the signal generator)? Is this a mains insulated set? Obviously it has a power transformer and all E-type tubes, but the U suffix was often used to denote AC-DC sets, at least with Philips. And no it has no selenium rectifier as you said once in the video, because it has the EZ80 rectifier tube.
Once you have the power supply, and audio output working as specified in the circuit diagram, the front end FM and AM shouldn’t, by the look of things, present too much of a challenge. Mr Tipton looks to have what most of us very likely crave - and that is space, and a well equipped workshop. I like the look of your Grundig radio. Once it is working, and it’s cabinet restored it will be a more attractive radio. Should it be of interest to you, I have uploaded the first two, of four videos featuring the reconditioning of an Ekco, model AD75. Parts 3, and 4 will de uploaded this coming weekend. Regards, Phil.
Hi Manuel, but you repair all these sets for yourself, or for friends/customers/those who ask? I can't imagine your wife living with a vintage radio collection... So as mine :D
I started off doing them only for myself, but when I got to 22 sets at home, my wife demanded an “intervention” 😊 I have subsequently sold a few, and done a lot of restorations for friends, so I get the pleasure without the inventory. I’ve also got radios spread around, some being in my office which the staff actually like. Some, like this one, is still mine. It seems that if I keep the numbers at home below a certain figure, my wife is OK with it 😃
Isn’t it amazing that someone can try to restore a radio that has such poor soldering skills. I mean soldering it just isn’t difficult really. Anyway nothing you cannot sort out. Thanks for sharing regards Chris .
Soldering is pretty damn hard with a crappy, unregulated soldering iron with a worn tip. Like that thing you (probably) got at the hardware store when you got into soldering... Some people probably never got an upgrade for whatever reason. With those crammed 50s point2point chassis types, It's like trying to defeat the Ender Dragon in Minecraft with a wooden sword, lol.
@@westelaudio943 I find that point to point stuff is best done with a gun. Even with a halfway decent regulated soldering station I find myself cranking the heat higher than ideal (tip gets nasty fast). It would indeed be impossible with a unregulated 30 watt iron.
@@electronicsoldandnew No worries buddy. I can see how easy it is to slip up. It's not common for a German set to have a tube rectifier. Keep up the good work. I have a similar Nordmende compact set in ready for resto Let's see what entertaintment that brings!
Nice little project. Impressive construction. I didn't expect to see such quality inside a small radio of that era. I suppose, the wooden shell is a giveaway for quality internals but the two are not always tied together. Interesting comment, that the nicotine protected the chassis. I often wonder the same thing when cleaning up the interior of tube gear from grime: am I doing the right thing? The grime sure has done a great job preventing the steel parts from rusting so far, so why am I removing it? Plus it contains valuable info as to its former owners for the future archaeologist... I'm going hold you to your statement that B&O gear are built in an ergonomic way and wait to see when you'll attempt to repair one again ;) Anything shorter than a year will hugely impress me ;)
The small radios from companies like grundig and telefunken are generally quite good. I see your point about removing the “protective coating” of grime, but I guess a good coating with WD40 is the be at we can give it now. As for the B&O, it’s not forgotten, just on sabbatical for a little while 😊
@@electronicsoldandnew Yep, plus with Grundig you also get a great loudspeaker driver. The bigger ones have especially nice units - at least, appealing to my taste. Shame about the Sabas: their great speaker units has been therir downfall - I expect you won't be able to find a Saba radio with original speaker units inside anymore, which is a great shame.
It's good to see a simple, old fashioned Valve/Tube radio back on the bench. No computers to worry about here.
I think this one will clean up nicely.
I think so too.
Estes radio alemães desta epoca são realmente muito bem construidos , eletricamente e mecanicamente.
Gostamos muito quando voce trabalha com estes radio valvulados !!!
Vamos aguardar os proximos capitulos.
Saudações ao povo da ilha da Madeira !!!!!
São Paulo - Brasil
Saudações da madeira.
David Tipton goes way above & beyond in his restoration. But you do a very good restoration as well! I always give you a thumbs-Up before you even start a project, since I know you'll do an excellent job!
Thanks. I’ll try not to let you down.
Back to basics and I like it. You have taught me a lot by doing the solid state units but I love these tube sets, this is a nice little radio. I'm anxious to see what you find wrong. Thanks for the shout out. Cheers!
The shout-out in this case is very well deserved. I believe that this community is quite small, and we always like to find new creators to feed our addiction 😃
Hello. Always enjoy your videos and you always end up with great results. I saw the David Tipton video and he did an amazing job with the cabinet. I am also very confident that you will achieve a great result as well. Can't wait for the next video. Keep up the good work. Chris.
Thanks Chris.
this is a really neat rare grundig,love it
Enjoy the series.
A nice "Hot bottles" set so looking forwards to your next instalment, Manuel.....
Coming soon
Lovely little set. The special chocolate block connecter made it so much more errr.... fun to look at!. I was surprised you didn't throw a signal up the gram input though. Never mind, it will come to life pretty soon I'm guessing
George Christofi : it will, and I did touch the PU connector at some point but don’t have it on camera.
Looking good so far.👍🏻
Thanks
Looks like a nice one. Very similar to my Grundig so I will be following this one closely.
Enjoy it.
This is where a signal tracer could come handy :) I had the same symptoms and used an amplified speaker for the purpose, and this let me realise that the audio stage was out but the radio was fine. Unfortunately, it was the output transformer that was fried and like this one, it had a special primary tap where B+ is injected. Had to use a standard transformer for the output tube and inject B+ through a resistor to the top of the original transformer connection.
That works fine. If you still get too much hum, you can always add a slightly bigger filter cap after that resistor.
Looking forward to part 2 now👍Good luck with the final diagnosis . 73 Ian.G7HFS
Thanks Ian
I'm looking for a german radio for my next project. Looking forward to another great restoration!
These are a good option to restore. Very “simple”’and they usually produce great results.
Yes! Tubes again! Thanks for sharing!
Pleasure
This will get exciting! I love this littel things too.
😊
I love those old German radios. Have about 6. Hopefully I will learn enough to get them working. The multi cap caps confused me at first. Figured that out.
6 is a good number to have :)
Well that's an interesting looking selenium rectifier tube :P
Yes. When I get excited I invent components :)
Hi Mr C, just bought a lovely Bakelite Philips 39969 (in post, Hermes) so fingers crossed. £27 posted.
Nice price. Good luck.
You're starting to do troubleshooting like me.. Quick n easy! I'm betting it's the audio section. Hopefully not the output transformer.. Bonne chance!!
Quick and dirty, with or without the bang :)
That's part of the fun. I made a 3300uF capacitor go bang a while ago.. proved the big bang theory in my own basement! 🤣🤣
its like tobacco burst finish on a guitar ..nice.. noticed some guitars on your wall do you get to play them often?
It’s tabaco sunburst on the case, and tabaco residue on the chassis :)
I play both guitars more regularly than well :) they are both Lag. One is the tramontane and the electric is the imperator. I like them.
This is going to be good!
Hi Alan. I sure hope so :)
Allways intresting love it .did you import the radio or a local island radio great channel content
This one came from Germany. The radios in Madeira are quite rare, and hence too expensive for these restoration projects.
@@electronicsoldandnew great job and love your channel when in Las palmas last i saw 2 tube radios in junk store off l playa de las canteras near auditorio Alfredo kraus
Great video, looking forward to part 2. Just wondering if you use an isolation transformer.
He does.
Yes, and it’s saved me from quite a few zaps, I’m sure.
Part of the output transformer windings is used as the power supply choke! I had often thought of this idea and wondered why it wasn't used in practice. It's very exciting finally to see an actual implementation!
I bet the ceramic mains plug is a retro-fit. Given this is an FM era radio, it's not what I would expect to find at the end of the mains lead. Either a plastic or a bakelite plug would be the norm, I reckon. Plus, the ceramic plug shouldn't have survived this long. It looks to be brand new so maybe it was recently acquired? Interesting find anyway.
One thing I wanted to ask you is how you tackle rust in the transformer laminations. Spraying with WD40 or other rust removal substance is something I'd never do as it would penetrate through the laminations and potentially contaminate the paper. What I sometimes resort to is rubbing with aluminium foil but that is not ideal because a) it's a temporary fix and b) bits of aluminium get everywhere if you're not careful - not at all a good thing. The proper thing would be to sand it down and paint over with a primer and then paint but I don't want to lose the patina.
It’s a great plug, but definitely did not come from the factory. I’ll be going through the schematic in some detail, as I’ve also found a few quirks that may interest somebody. The choke idea is used in many German radios, and certainly has a great effect on hum reduction.
@@electronicsoldandnew I wonder why tube amp makers don't use the same idea. You often see loudspeaker field-coils used as the PS choke so my ultimate fantasy implementation of the idea would be a combined field-coil, choke and output transformer! Now that would be something to witness happening!
Practicalities aside, the only downside I see with the ceramic mains plug is that you then have to retro-fit your house with ceramic mains sockets and light switches to match! ;)
😊
On my 4192 had the same problem on you're radio tone on my radio it's balance ..Ican't see away to clean the Volume /balance control how do I get some Deoxitin it ? Still have thay hum with my radio tuning and volume have no effect on the hum recap resistance checking..Only the Selinium rectifier hasn't been changed B+ is fine..So very hot transformer and hum.. Radio not happy.. I find your videos very intetaining your a True Craftsman with these radios..Best regards,
Thanks 😊
Why didn't you switch it to pickup and check that the audio amp is working (very loud hum when touching the input with your finger or use the signal generator)? Is this a mains insulated set? Obviously it has a power transformer and all E-type tubes, but the U suffix was often used to denote AC-DC sets, at least with Philips. And no it has no selenium rectifier as you said once in the video, because it has the EZ80 rectifier tube.
It does in fact have the ez80. My mistake. The power transformer has a little surprise up it’s sleeve, as I’ll report soon.
Once you have the power supply, and audio output working as specified in the circuit diagram, the front end FM and AM shouldn’t, by the look of things, present too much of a challenge.
Mr Tipton looks to have what most of us very likely crave - and that is space, and a well equipped workshop.
I like the look of your Grundig radio. Once it is working, and it’s cabinet restored it will be a more attractive radio.
Should it be of interest to you, I have uploaded the first two, of four videos featuring the reconditioning of an Ekco, model AD75. Parts 3, and 4 will de uploaded this coming weekend.
Regards, Phil.
Yes, I wish I had the space and the tools he has.
Thanks for the reminder about your restorations.
Hi Manuel, but you repair all these sets for yourself, or for friends/customers/those who ask? I can't imagine your wife living with a vintage radio collection... So as mine :D
I started off doing them only for myself, but when I got to 22 sets at home, my wife demanded an “intervention” 😊
I have subsequently sold a few, and done a lot of restorations for friends, so I get the pleasure without the inventory. I’ve also got radios spread around, some being in my office which the staff actually like.
Some, like this one, is still mine. It seems that if I keep the numbers at home below a certain figure, my wife is OK with it 😃
@@electronicsoldandnew I see... So you're not retired?
If u interesting i ve a radio like it with the sign in the middle,but not the down button n it is working,just need some lil repairs
Thank you but right now I have too many projects in the go.
You kept saying selenium rectifier... I thought you said this radio has a tube rectifier???
Yep. Old habits when doing the video.
Running out of room for big sets?aahahah i feel your pain.!!! This hobby is an addiction
Absolutely 😃
Isn’t it amazing that someone can try to restore a radio that has such poor soldering skills. I mean soldering it just isn’t difficult really. Anyway nothing you cannot sort out. Thanks for sharing regards Chris .
After a few of these, you aren’t surprised anymore with the hacks some people do :)
Soldering is pretty damn hard with a crappy, unregulated soldering iron with a worn tip. Like that thing you (probably) got at the hardware store when you got into soldering... Some people probably never got an upgrade for whatever reason.
With those crammed 50s point2point chassis types,
It's like trying to defeat the Ender Dragon in Minecraft with a wooden sword, lol.
@@westelaudio943 I find that point to point stuff is best done with a gun. Even with a halfway decent regulated soldering station I find myself cranking the heat higher than ideal (tip gets nasty fast). It would indeed be impossible with a unregulated 30 watt iron.
Selenium rectifier?
My bad. It has a tube rectifier.
@@electronicsoldandnew No worries buddy. I can see how easy it is to slip up. It's not common for a German set to have a tube rectifier. Keep up the good work. I have a similar Nordmende compact set in ready for resto Let's see what entertaintment that brings!
Nice little project. Impressive construction. I didn't expect to see such quality inside a small radio of that era. I suppose, the wooden shell is a giveaway for quality internals but the two are not always tied together. Interesting comment, that the nicotine protected the chassis. I often wonder the same thing when cleaning up the interior of tube gear from grime: am I doing the right thing? The grime sure has done a great job preventing the steel parts from rusting so far, so why am I removing it? Plus it contains valuable info as to its former owners for the future archaeologist...
I'm going hold you to your statement that B&O gear are built in an ergonomic way and wait to see when you'll attempt to repair one again ;) Anything shorter than a year will hugely impress me ;)
The small radios from companies like grundig and telefunken are generally quite good.
I see your point about removing the “protective coating” of grime, but I guess a good coating with WD40 is the be at we can give it now.
As for the B&O, it’s not forgotten, just on sabbatical for a little while 😊
@@electronicsoldandnew Yep, plus with Grundig you also get a great loudspeaker driver. The bigger ones have especially nice units - at least, appealing to my taste. Shame about the Sabas: their great speaker units has been therir downfall - I expect you won't be able to find a Saba radio with original speaker units inside anymore, which is a great shame.
I like it when you can actually see the chassis and components color. I havent got so lucky =)