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Stella ST415T: Russian GT322B transistors in place of AF117’s

Stella ST415T: Russian GT322B transistors in place of AF117's

I picked this little Stella transistor radio from around 1962 up at a amateur radio rally for £1. It is in a state and has no back panel. I thought I would have a mess with it and try out some Russian GT322B transistors in it. See how I got on.

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Tags: transistors

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  1. Date: August 24, 2016 at 09:44
    Author: No Name

    Cool! Wish we could hear Gary Neuman on AM over here; I don't know what would come in on LW, since it wasn't commonly used for broadcasts in N. America. From my memory, a lot of those early germanium transistors (at least in RCA and Motorola sets) were socketted, but this must have been just after all that ended. Good job.

  2. Date: November 2, 2016 at 21:39
    Author: jmcgatkinson

    Perhaps, in the old AF 117 transistors, microscopic 'dendrites' formed around the P-N-P junction, in the material in which it is embedded, after a long period. It might be about the crystalline structure of the doped germanium altering through its use…
    I guess, as chemical improvement (doping materials and fabrication) over time, the Russian devices are an ideal replacement.

  3. Date: March 1, 2017 at 16:49
    Author: douro20

    I read once that the Soviets became very good at making germanium transistors because at one time there was a shortage of good quality silicon. Some of the world's first germanium microwave transistors were actually made in the USSR.

  4. Date: October 27, 2017 at 12:14
    Author: Arthur Hemerik

    Thank you for this great demonstration. I own a Roberts R200 with Tin wiskers (AF117) and I get soon AF137 and a OC44 or 45 for trying to replace them.
    I will also try to get the Russian transistors. I let you know the results!
    Greetings from the Netherlands!

  5. Date: November 6, 2017 at 00:38
    Author: Kennynva T.

    I thought of a good idea for you….when having to tap the transistors…use a automatic punch…which is a tool you use to put a small dimple in metal, then that will give your drill bit a starting point..Do you know what tool Im talking about…??

  6. Date: December 3, 2017 at 11:35
    Author: Arthur Hemerik

    I also have this radio with the Philips brand on it. It is very sensitive indead!

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