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

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

Date: May 5, 2016
Author: admin
Tags: AF117 British Electronics GT322B Mullard radio Russian Stella ST415T transistor Transistor Component Transistor Electronic Components transistors Transistors Components Transistors Electronic Component YouTube Editor
Categories: Transistors

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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9 Comments

Date: May 6, 2016 at 21:15

Author: Andrewausfa

Yes Gary Numan!! That works well doesn't it?
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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.
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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.
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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.
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Date: July 2, 2017 at 15:35

Author: Richard proctor

I enjoyed your video
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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!
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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…??
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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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Date: January 15, 2018 at 23:17

Author: Buddhafollower

GT322V not B
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