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mc-100b

  1. CZ4A

    T-S 6550 biasing in Yaqin MC-100B

    I have a quad of strong, vintage Tung-Sol 6550s (marked RCA) that I want to use in my bone-stock Yaqin MC-100B. I've seen posts here and elsewhere saying the T-S 6550s have been used in this amp before, but no mention of bias voltage. The factory-recommended bias voltage is 0.55V (even says so...
    • CZ4A
    • Thread
    • 6550 mc-100b tung-sol yaqin
    • Replies: 1
    • Forum: Tube Audio
  2. CZ4A

    Too much juice into Yaqin MC-100B, or just bad luck?

    I recently bought a used Yaqin MC-100B that came with all the stock tubes. I've rolled the 6SN7s and 12AX7s with vintage tubes I have stashed away. Unfortunately, the filament died on one of my rolled 12AX7s (a Telefunken smooth-plate, no less. Grrr...). After the T-Funk half-died I put the...
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