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tube biasing

  1. Carbsandcaps

    Chinese tube bias tester

    Has anyone used one of these inline tube testers? I got a good deal on one so I figured I’d give it a shot on my fisher x-202-b. Seems to be pretty accurate that is assuming it’s measuring amperage and not voltage and the tubes have a nice blue glow to them. Fisher doesn’t give an amperage...
  2. S

    Any help with this 6sn7 circuit biasing

    Hey guys just wondering if someone can help me with this kit amp it's a 6sn7 quad pp preamplifier biased hot in class A It's got a 300v CCS power supply And was shipped with the specified parts for 300v operation I only have a 250v transformer so my bias will be off a little and not hot enough...
    • Steptoe6sn7
    • Thread
    • 6sn7 preamp tube biasing
    • Replies: 5
    • Forum: DIY
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