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 Post subject: Daugava (gramophone) 1957
PostPosted: Jun Wed 08, 2022 5:15 pm 
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A couple of days ago I was at my daughter's school and saw a tube radio of a very unusual design in the class. I asked how it got there and they said that the director brought it. I went to the director and he said that he wants to make a museum in the school, but he cannot find someone who would help repair the radio.
https://www.radiomuseum.org/r/radiotehn ... phone.html
Today I was in the school and began to clean and recap radio.
Unfortunately it lacks one tube (someone inserted pentode instead double triode) and I have to find proper tube.
I also need to do something with the push buttons. They are made of fragile plastic and two buttons have already crumbled.
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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Thu 09, 2022 2:47 am 
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That radio is a very compact package. Maybe the first case where the phonograph doesn't impact the look of the cabinet.

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Fri 10, 2022 7:48 pm 
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I replaced all the electrolytic and paper capacitors and adjusted the coils a bit. Of course I installed a new valve. On a piece of wire 2 meters, it receives stations well. It remains to deal with a complex circuit for low-frequency correction and filtering (there is a hum) and repair the gramophone. The diagram does not reflect some of the installed elements.
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https://www.youtube.com/watch?v=Y8XyN78WnbE&t

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Mon 13, 2022 4:49 pm 
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New push buttons installed, receiver part is done!
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The gramophone is worse. I cleaned the motor of dried grease and it spins. But the plate lies on the base without a gap and someone has broken / changed the automatic switch-on assembly (in the photo on the right below). I want to find a photo of how it looked originally.
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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Mon 13, 2022 6:06 pm 
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Very nice job. Congratulations!


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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Thu 16, 2022 4:20 pm 
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Thank you!

I had to fiddle with the player. Initially poor quality and someone else before me tried to repair it. I had to understand how the mechanism works and align some parts. This is my first turntable repair experience. It rumbles and only has one speed (I'll need to find a rubber tube of the right size to cut the drive belt for another speed), but I don't have a vinyl record to test it out. This work cannot be called a restoration, but I believe that the radio has been repaired.

https://youtu.be/ty-X7KvDu5U

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Thu 23, 2022 3:53 pm 
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In the end, I even found a rubber ring for speed "33" and some records in terrible condition. Enough for demonstration. Another project completed.

https://youtu.be/-GhBI9_KSBo

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Thu 23, 2022 5:54 pm 
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Nice job. It is interesting to notice that the radio was made by The Popov Riga Radio Plant in Latvian capitol Riga and that the instructions on the inside cover of the turntable seem to be written first in Latvian and then in Russian. It makes me wonder whether these language preferences were retained only for Latvian market or for the entire USSR.

The Popov Riga Radio Plant was I think later renamed to its pre-war name VEF Riga and produced many multiband transistor radios. BTW, Daugava is the name of the river flowing through Riga.


Last edited by Jiri Placek on Jun Thu 23, 2022 6:01 pm, edited 1 time in total.

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jun Thu 23, 2022 6:00 pm 
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I don't know. Latvia, Lithuania and Estonia were occupied by the Soviet Union much later than the rest of the "republics", so they could continue to use their language after the WW2.

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 Post subject: Re: Daugava (gramophone) 1957
PostPosted: Jul Fri 01, 2022 7:28 pm 
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I made video https://youtu.be/9vSyxbfNY54

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