Stereo Circlotron OTL Project

This stereo OTL tube amplifier project is a continuation of my experiments with the circlotron output...

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Circlotron Vacuum Tube OTL Prototype

Vacuum tube audio amplifiers almost invariably use specialized output transformers to match the naturally...

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Antique Tube Tester Restoration

I picked up an old PAC 954-G tube tester from a ham swap meet for $3. The previous owner couldn't speak...

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Single Ended Amp Conversion

I picked up an old tube-based laboratory bandpass filter that was discarded. The challenge in this project...

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All Tube 20 Watt Audio Amplifier

This power amp was an experiment in designing an all-vacuum tube circuit. We take transistors for granted...

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