After a few modernizations and tweaks, the result is an 8-transistor stereo amplifier that’s aesthetically ... improvements to the push-pull bias circuit and limited the high-frequency response.

[Paulo] just tipped us about an Excel based high frequency transistor amplifier calculator he made. We’re guessing that some of our readers already are familiar with these class A amplifiers ...

The first transistor was about half an inch high ... This contraption was the very first semiconductor amplifier, because when a bit of current came through one of the gold contacts, another ...

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