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5751

  1. happybear

    Penncrest SE 50C5 tube console amplifier

    Penncrest AM/FM Phono console. The chassis was stripped and rebuilt as a SE tube stereo amplifier. SE 50C5 beam power mode finals driven by a cap coupled 5751 twin triode. SS diode rectified SS voltage doubler power supply with filter choke. Tuned the loop FBK network to improve square wave...
    • happybear
    • Thread
    • 50c5 5751 penncrest se single-ended
    • Replies: 11
    • Forum: Tube Audio
  2. happybear

    SE 6AQ5 with AES PT-31 OPT

    SE 6AQ5 with AES PT-31 OPT. The OPT's are older units, not the current production. 5751 driving stage. There were some issues regarding load dependent stability while figuring out the feedback circuit. Grid stop resistors and Zobel network across OPT resolved the stability problems. RT...
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