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I need advise on better modern day transistor in restoring my old Mac 1900 receiver.
The power amp section is very similar to the diagram attached, which is from the MC34V pre amp's monitor amp section, except without the current mirror and power guard. The basic diagram is just a differential input pair, a voltage amp, then pre driver, and NPN/NPN output vs the NPN/PNP here. The input stage I have used BC 560C, while for the driver, I am using the BD 139/BD140. Just wonder any other suggestion?
This is a very simple good sound amp, while working in class B...
It sounded better then lots of class A I have.
Tks and best rgds
William Lee
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Topic - Replacing old transistors - wlee 22:20:21 05/29/07 (1)
- Sorry wrong diagram, here is the one RE: Replacing old transistors - wlee 22:25:30 05/29/07 (0)