A brief history of Russian vacuum tubes

[EWBrown]

A brief history of Russian vacuum tubes

http://www.cqham.ru/rk3zk/files/vrt004.pdf

Russian "Old Radios" site:

http://oldradio.onego.ru/

[azazello]

Ed, I have this red receiver "Zwezda-54" - my is dark red - copy from French Excelsior. Stalin order about 5000.

[Geek]

Those look neat!

Far better aesthetics than one would figure from a pragmatic communist era.

[EWBrown]

Interesting design, using fixed grid bias provided by the two series resistors connected between the power xfmr CT and ground bus, in order to generate the negative grid-bias voltages for the output stage and IF amplifier.

A nice step up from the average 5 or 6 tube radio design . (I know, it has seven, but then I'm not factoring in the "magic eye")

/ed B

[azazello]

Those look neat!

Far better aesthetics than one would figure from a pragmatic communist era.

This is French designs - radio "Excelsior".
Ed, Telefunken 165 from 30-40-s use this bias. I have it.
https://www.google.bg/search?q=Telefunk ... B765%3B990

[EWBrown]

Most of the tubes in the Zvezda-54 "Red Star" radio could be directly replaced with USA types, except the 6P1P and perhaps the tuning indicator "magic eye".

6SA7, two 6BA6s, 6AL5, 6X4 (the schematic has pins 5 and 7 swapped) . As far as I know, there is no direct USA made plug-in compatible equivalent of the 6P1P.
However, it could be re-wired to take a 6CM6. Which is essentially a 6AQ5 or 6V6, with a 6CZ5 pinout.

/ed B

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