2019-07-06 Earliest Audio Amplifiers I built

from FB group Building Transistor Radios July 6
Bill Korbak
The early germanium alloy transistors didn’t have enough bandwidth for RF, they were only good for audio. That’s where I built my first amplifier, a three transistor audio amp on a PC board I etched in ferric chloride. I also built the power amplifier. It used the germanium power transistor called ‘Workman 99 Power’ because it cost 99 cents.

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