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GT320B=2N2654

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Forum » Valves / tubes - Semiconductors » VALVES/TUBES / SEMICONDUCTORS in RADIOMUSEUM » GT320B=2N2654
           
Omer Suleimanagich
Omer Suleimanagich
 
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26.Sep.17 11:43

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Can the GT320B replace a 2N2654  germanium transistor?

Günther Stabe † 19.8.20
Günther Stabe † 19.8.20
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26.Sep.17 21:24

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Here is the the Russian transistor - it would have to fit. Please compare the max. voltage!

 

This article was edited 26.Sep.17 21:26 by Günther Stabe † 19.8.20 .

Stan Roberts
 
 
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27.Sep.17 01:39

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Hi Omer.

According to my old “Transistor D.A.T.A. Book” Edition 45 (Feb. 1979), the 2N2654 was a small signal (100 mW) germanium VHF transistor with a power gain of 20 dB max at 100 MHz. VCBO is 25 volts max. Base outline is TO12. I have several NOS AF139 and AF 239 types, which may well work as a substitute as they were designed for VHF/UHF up to 500 and 700 MHz. I will likely never use them, so I would happily send you a couple of each since I’m not far away here in northern California. You can find the data sheet for the AF239 online. I can include the TO12 lead identification diagram for the 2N2654, too. As Günther has noted, please compare and check the maximum working voltage.

Omer Suleimanagich
Omer Suleimanagich
 
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27.Sep.17 02:56

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Thank you very much for the offer, and I will privately send you my mailing address

My little exercice that I am doing here, is to explore the possible Russian germanium transistors that can substitute germanium transistors that were manufactured in the West over fifty years ago, that have lost gain , are leaky, and suffer the infamous internal "dendrite disease

The Soviet Union, on the other hand, got quite good at manufacturing and further developing germanium transistors, until the early nineties 

When RMorg started, many members here discussed the use of Russian vacuum tube substitutes, that brought to life many eye tubes and power tubes in older sets

There are many transistor radios out there that are shelf queens because no one has the experiance and enough cross reference sheets to restore them

Thank you very my much for your input

Omer Suleimanagich
Omer Suleimanagich
 
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27.Sep.17 09:25

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Reply  |  You aren't logged in. (Guest)   5 Here is the IF block of the Fisher 600T

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