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  1. A

    MKIIA Grounding

    Now the relay chatter is back for some reason! It seems like the relay needs its own power supply.
  2. A

    MKIIA Grounding

    Rewiring the Master 1 as a pot rather than a rheostat is a definite improvement. The sense I'm getting is that the MKIIa was a disaster, the MKIIb was kind of a band-aid over the problems, and the MKIIc was the big redesign
  3. A

    MKIIA Grounding

    Grounding the caps for nodes "C" and "D" seems to help with the hum in the overdrive channel. In the MKIIa there's a cathode follower on V2 feeding the master volume pot that has 260v on the cathode. That's way too much heater-cathode potential and pretty much guarantees heater noise in the...
  4. A

    MKIIA Grounding

    Has anyone had success changing the grounding scheme on the MKIIA? I have one on he bench that has the usual hum and noisy reverb. I noticed that the preamp tubes all ground to the input jack while most of the filter caps for the preamp section are grounded through the mounting posts of filter...
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