el509

  1. Mark (Basspig) Weiss

    Re-Living My Past (OTL Vacuum Tube Builds)

    Way back in the '60's I wanted to build a hi fidelity amplifier, but could not afford the output transformer of that quality. So I looked over several tubes that had low plate resistance and settled on the 8020/6AS7 back then and built an amp with 3 6AS7's. It put out 25W into 16? loads and was...

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