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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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13th Nov 2014, 1:30 am | #41 |
Dekatron
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Re: Restoring my old Soviet radios
You just inspired me to sketch this out:
It's an attempt at breaking down a coil into distributed inductance, resistance and capacitance. It's obvious that that would have some really nasty resonances. Short-circuiting it and so robbing some energy from the other coil looks as though it would be less bad than leaving it open-circuit.
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20th Nov 2014, 8:38 pm | #42 |
Heptode
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Location: Mayabeque, Cuba
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Re: Restoring my old Soviet radios
Some pictures of the radio with the "new" speaker fitted. It sounds very well.
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21st Nov 2014, 3:15 pm | #43 |
Heptode
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Re: Restoring my old Soviet radios
Hi Miguel,
That new speaker installation looks really neat and professional! You do meticulous work as usual. I have been enjoying and following your exploits on this forum for a long time. One comment though about that flat cable connection you have there, that you have shown to us in a previous post as well. I am not sure that having such long wires and also running them next to each other for those signals is a good idea. Those are the connections to the oscillator and antenna coils on the turret from the board where the active components of the circuits are, and that radio goes up to 21MHz in the 13m band! I realize that working on the main board of that radio is a pain. (I did replace the electrolytic capacitors on my radios, so I speak from experience.) As an alternative, I would have used short flexible individual wires to the turret from the top of the board and used the longer cables for the rest of the wiring to the board that carries the power and audio signals. In this case you could still fold up the board along that "hinge" at the top and be able to work on it, and it would not compromise the integrity of those signals. Regards, Peter |
21st Nov 2014, 8:20 pm | #44 | |
Heptode
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Location: Mayabeque, Cuba
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Re: Restoring my old Soviet radios
Hi Peter, thanks for your kind words.
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21st Nov 2014, 11:48 pm | #45 |
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Re: Restoring my old Soviet radios
The Selena in particular is a very good performer on MW. I would expect it to receive many stations from outside Cuba, such as from Florida or the other Caribbean islands.
You might want to try LW when it is night over the Atlantic. You might even hear BBC Radio 4 on 198kHz, though there are several more powerful transmitters in Europe and North Africa which may be easier to receive. There were LW transmitters in Iceland at one time, but I think they have closed now. |
22nd Nov 2014, 2:56 pm | #46 |
Dekatron
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Re: Restoring my old Soviet radios
That's a neat repair; and interesting because it's a little unusual.
Here in the UK, there are still plenty of scrap sets to use for spare parts. So most people here would just replace a loudspeaker, unless it was an especially uncommon type. For instance the Bush DAC10 speaker, with its voice coil and magnet in front of the cone, to save space inside the set; or the PAM 701, the first transistor set, with a centre-tapped voice coil; each end went to one of the output transistors' collector, and the centre tap to battery (-), saving an output transformer. P.S. Did you manage to understand my attempt to speak (well, write) Spanish?
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22nd Nov 2014, 4:39 pm | #47 | |
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Re: Restoring my old Soviet radios
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24th Nov 2014, 2:14 pm | #48 | |
Heptode
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Re: Restoring my old Soviet radios
I will try LW on the Selena tonight.
Quote:
By the way, a friend of my uncle gave him another VEF-206 set. He says that the cabinet is in better condition than the previous one. I will pick up that set tomorrow. I will use the best parts from both to complete one set and will keep the rest for spares. Maybe if this new set is in general good condition, I will try to repair both. I will let you know on Wednesday or Thursday.
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28th Nov 2014, 2:25 pm | #49 |
Heptode
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Re: Restoring my old Soviet radios
The radio on the last post is finished. Sorry, I did not take a picture. It looks very similar to the one in the openning post of this thread. I used the cabinet from another set that my uncle got. Now I'm trying to finish this "new set" to fit it in the previous cabinet, so my uncle will have two radios, instead of one.
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28th Nov 2014, 3:31 pm | #50 | |
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Re: Restoring my old Soviet radios
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1st Dec 2014, 10:08 pm | #51 |
Heptode
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Re: Restoring my old Soviet radios
Here some pictures of the second radio. Those knobs are the same that I had on the previous set. As the second radio had all the knobs, I used them with the set that I finished and delivered to my uncle. Then I used the knobs seen here with this radio, cause I have no other. Those knobs are from a Soviet TV set.
Notice that this radio has a small tandem capacitor for tunning. Those came in the last sets that were brought to Cuba. I ignore the reason why the Soviet used diferent colors for the coils arrangements in the turret switch. You can also see the PCB that I built to supply 9V DC using the transformer from my uncle's Siboney, which curiously. was originally from a VEF-206. And finally the transformer and the PCB inside the batteries compartment
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8th Dec 2014, 6:39 pm | #52 |
Heptode
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Re: Restoring my old Soviet radios
Finally I finished this radio. It really look awful. No handle, no side-knobs, the cabinet in bad condition, no original front knobs......but it sounds nice.
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8th Dec 2014, 7:33 pm | #53 | |
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Re: Restoring my old Soviet radios
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11th Dec 2014, 10:48 pm | #54 |
Heptode
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Re: Restoring my old Soviet radios
I didn't think I was going to join the Soviet radio club, but I seem to have done so. This is my VEF-206, I at least think it is.
How do I proceed with this? First I was very disappointed when I saw the inside of the radio, but when I had a closer look I remembered this thread and discovered I had acquired a soviet radio. (Even Philips wouldn't have produced a bodge job like this.) I found the diagram on the net and think I'll apply some power when I get time after Christmas. |
11th Dec 2014, 11:06 pm | #55 |
Heptode
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Location: Mayabeque, Cuba
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Re: Restoring my old Soviet radios
It really look like a VEF-206 (or a 204 maybe).
Can't see the ferrite antenna Hope you can make it work. You're most welcome to the Soviet Vintage Radio Club !!!!!
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12th Dec 2014, 1:19 am | #56 |
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Re: Restoring my old Soviet radios
Just to clarify, I think Hans and Miguel are joking. This is not a Soviet radio. See this thread: https://www.vintage-radio.net/forum/...d.php?t=112124
Please stay on topic. |
12th Dec 2014, 1:34 am | #57 |
Dekatron
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Re: Restoring my old Soviet radios
But it does look like a transplant into an old cabinet?
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12th Dec 2014, 1:39 am | #58 |
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Re: Restoring my old Soviet radios
It's certainly a mess, but I don't think it looks like a VEF-206 circuit board (though Hans and Miguel are welcome to correct me).
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12th Dec 2014, 8:31 am | #59 |
Dekatron
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Re: Restoring my old Soviet radios
That turret tuner does make me think that it's a 1930s Philips with a 1970s Eastern-Bloc set rammed inside.
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12th Dec 2014, 8:53 am | #60 |
Heptode
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Re: Restoring my old Soviet radios
This isn't a joke. I got it like this.
The old chassis is cut in half and the old tuning capacitor is used to tune the VEF. The tuner is mounted where the removed part of the old chassis used to be and one old button is put on the rod to make everything look original. The speaker seems to be taken from a third set. It isn't the original and looks too big for a transistor portable. I've tried to turn the tuner but a lot of force is required. Is that normal? The ferrite rod is there, it is mounted just under the top of the cabinet. |