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High power Germanium power amplifier (any thoughts??)
High power Germanium power amplifier (any thoughts??)
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Old 3rd July 2020, 09:21 PM   #41
CaterpilarSK is offline CaterpilarSK  Slovakia
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Join Date: Jan 2018
Location: Slovakia, Nové Zámky
Quote:
Originally Posted by OldDIY View Post
Thats more like what I was looking for. Simple and appears to be effecitve enough. Just a bit worried the feedback will delete or nulllify the mumbo jumbo of the germaniums. Oh well Ill try and create
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Old 4th July 2020, 01:38 AM   #42
yeti is offline yeti  Germany
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Join Date: Nov 2001
Location: Ewersbach
In the time of germanium transistors PNP was king.. TO3 Transistors had a3mm thick copper housing.Base to emmitter voltage was about 0,3 V. Still nowadays they use germanium Diodes for HF rectification..low threshold voltage and smooth transition from non conducting to ON similar to a thermionic tube. The problem was .. if a germanium transistor reaches a temperature above 75 degrees centigrade it will thermally runaway into selfdestruction.At ambient temperature of..say 35 degrees you have another 35 until failure, with silicon in TO3 you have 200 degrees to failure thats a margin of 165degrees. whats it about: you can replace low power AC or OC..(germanium transistors) by BC or 2SA 2SC(silicon transistors) by doubling the value of the resistor thats between the base and the emitter. if there is AA118 or like that..try a schottky diode.
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Old 4th July 2020, 03:05 AM   #43
OldDIY is online now OldDIY
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Join Date: Dec 2009
Quote:
Originally Posted by CaterpilarSK View Post
Thats more like what I was looking for. Simple and appears to be effecitve enough. Just a bit worried the feedback will delete or nulllify the mumbo jumbo of the germaniums. Oh well Ill try and create
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