It is a 45V, 10A, 90W PNP Audio Output TO3 GERMANIUM transistor.
At least NTE121 and 68P1B is something like.
... See attached data ....
The hFE gain is good: 50-165, typ 90
VBE at 1A is only 0.38V ... which is a Germanium feature
fT, upper transistion frequency is low: 300 kHz
but this enough to make a good output follower stage
I am sure someone would like to try those.
Always nice to explore nice things. New challenges.
We have had several threads about old Germanium devices.
At least NTE121 and 68P1B is something like.
... See attached data ....
The hFE gain is good: 50-165, typ 90
VBE at 1A is only 0.38V ... which is a Germanium feature
fT, upper transistion frequency is low: 300 kHz
but this enough to make a good output follower stage
I am sure someone would like to try those.
Always nice to explore nice things. New challenges.
We have had several threads about old Germanium devices.
Attachments
Thanks for the info. This amp is free to anyone here who might like it. I don't have a use for it so it's better to go to someone here who might like it then find it's way into a landfill. Cover shipipng it's yours. Just thought I'd offer. 🙂
I had a chance to test this amp. It does work. Doesn't sound half bad either. It originally powered 2 of the speakers in the picture. 12" woofer and a horn tweeter. I'd guess it's ~25w/ch or so.
I really don't have any idea. Last time I shipped something out of the states (dvd player) it was over $100 in shipping.
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