RunOffGroove Fetzer Valve Revisited. This circuit aims to emulate 12AX7 triode stage in Fender amps. It uses a J201 N channel J-FET. Carefully biased, it works pretty well, you get a neat, loud and full of harmonics sound, with a lot of gain (depends on the J201, it's better to sort and measure them with the method described on RunOffGroove.com). I've added 2 resistors nets to avoid trimmers (I do...
A breadboard-compatible dual non-inverter audio amp built around an opamp.
Exposes most of its internals on pins for more versatility (variable gain, simple filter, ...). Some parts are optional.
Can be stacked to create a mixer with 1 board per stereo channel and 1 board for a master volume.
Схема Hi Dev! Preamp
Собираем своими руками двухканальный ламповый предусилитель на отечественных лампах 6Н2П.
Первый чистый канал копия Fender Twin, второй перегруженный канал основан на Mesa Boogie Dual Rectifier.
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