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6J1-Tube-Amp_test - EasyEDA
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Project: diy more tube-based pre-amp kit (6j1 “fever” clone)
Matching triodes for differential outputs .
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Project: DIY More Tube-based Pre-Amp Kit (6J1 “Fever” Clone) | Gough's
Single Tube RIAA preamp too good to be true? - diyAudio
matching triodes for differential outputs - Page 2 - diyAudio