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bd139thing

The BD139 Thing is a 300mW RMS stereo Hi-Fi Class-A amplifier.

It is pairable with a set of very high sensitivity (>90dB) speakers for audio playback.

Distortion analysis has not been done yet, but THD/IMD is probably 5-10%; most of it is pleasing "tube sound like" distortion, transistorized.

Current state

I am working on another revision of the design. The BD139 cascode is modular, meaning it can have many in parallel when paired with a suitable power supply and power filtering capacitors. Heat dissipation on the negative feedback shunts and power delivery are primary concerns.

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2x 300mW Class-A stereo amplifier.

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