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High power Germanium power amplifier (any thoughts??)
High power Germanium power amplifier (any thoughts??)
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Old 2nd July 2020, 04:27 PM   #21
OldDIY is online now OldDIY
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The output stage topology is similar to JLH1969.
But it can work in AB. It gives hope for a good sound)))
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Old 2nd July 2020, 10:08 PM   #22
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page 86:
_https://worldradiohistory.com/Archive-Electronics/50s/Electronics-1959-05-29.pdf

_http://www.one-electron.com/Archives/RCA/RCA-LB/LB-1082%20RCA%20Labs%201957%20High-Power%20Transistor%20Audio%20Amplifiers.pdf

page 930:
http://www.introni.it/pdf/Costruire%...%201967_12.pdf
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Old 3rd July 2020, 12:01 AM   #23
CaterpilarSK is offline CaterpilarSK  Slovakia
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Quote:
Originally Posted by PRR View Post
When I started, Ge was the only kind we could afford.

The early 1960s General Electric Transistor Manual has good examples.

Simply Googling your thread Topic brings up some stuff. more if you flip into "Images".
High power Germanium power amplifier - Google Search
I disagree. Google did not really help me in this regard. Pay closer attention to the schematics you realise 70% of them arent even GE transistor ones, and the few actual germanium ones are low power amplifiers.
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Old 3rd July 2020, 12:09 AM   #24
CaterpilarSK is offline CaterpilarSK  Slovakia
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Quote:
Originally Posted by JMFahey View Post
Sorry but no, not here.
First you would need **germanium** diodes or at least a Germanium transistor as thermal sensor bu............................where diodes were not. (thermistors are bidirectional while diodes are not).
I agree why reinvent the wheel when you only need one...well the parts to make the wheel are basically dieing out. I just want to know if using silicon transistors (PNP and NPN) to drive the output finals germanium transistors would be reallistic. I am not looking specifficaly for extreme retro accuracy. Just want to hear the thing work.

My worry now is the biasing of the finals. With using germanium finals and silicon drivers I have no idea how it would behave at all..
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Old 3rd July 2020, 12:14 AM   #25
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High power Germanium power amplifier (any thoughts??)
Quote:
Originally Posted by OldDIY View Post
The output stage topology is similar to JLH1969...
I don't see it.
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Old 3rd July 2020, 12:36 AM   #26
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High power Germanium power amplifier (any thoughts??)
Quote:
Originally Posted by CaterpilarSK View Post
...the few actual germanium ones are low power amplifiers.
OK.
Attached Images
File Type: gif 20W-GE-Burwin-1-42.gif (68.5 KB, 49 views)
File Type: gif 20W-GE-Burwin-2-42.gif (28.5 KB, 53 views)
File Type: gif 1KW-GE-Burwin-1-42.gif (58.3 KB, 52 views)
File Type: gif 1KW-GE-Burwin-2-42.gif (74.0 KB, 47 views)
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Old 3rd July 2020, 12:38 AM   #27
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Try the first (top) circuit of #20. The output stage topology resembles JLH1969. You can play within reasonable limits (up to 200 mA) with a quiescent current and voltage (up to 40-50 V). The first cascade is not needed.
It gives hope for a good sound)))
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Old 3rd July 2020, 12:55 AM   #28
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Quote:
Originally Posted by CaterpilarSK View Post
Just want to hear the thing work.
-Alloy germanium transistors do not work well at frequencies above 5-10 kHz.

My worry now is the biasing of the finals. With using germanium finals and silicon drivers I have no idea how it would behave at all..
-Don't worry...
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Old 3rd July 2020, 01:05 AM   #29
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Pay attention to #12 (post #24) with OpAmp.
In the bottom circuit #20, simply replace the AD149 with 3NU74.
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Old 3rd July 2020, 01:09 AM   #30
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AC127P/AC132P replace with BD139/BD140.
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