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  1. S

    MK 2C+ Class A question

    Thank you for letting me know! Seems like all is well.
  2. S

    MK 2C+ Class A question

  3. S

    MK 2C+ Class A question

    Keep in mind these voltages were measured without power tubes installed. I believe they come down to -55 (A/B sockets) with tubes installed. I'll get a few pictures up later tonight
  4. S

    MK 2C+ Class A question

    The resistors on the power tube board are all within 1% or very close. I took some measurements on the power tube board without the power tubes installed. Bias Supply at (E) is -72.5 after 220k resistors -60.5 @ #1 socket (class A triode) -49.0...
  5. S

    MK 2C+ Class A question

    I swapped the pairs and measured 14ma per tube for the a/b spots. The Class A sockets are again 46ma.
  6. S

    MK 2C+ Class A question

    The tubes I'm currently testing with are yellow grade. The class A tubes are idling at 46-48. The a/b tubes are 18-20ma.
  7. S

    MK 2C+ Class A question

    Thank you for the tip regarding the coupling caps. I checked them for leakage but left them in. Regarding the EL34's, I spoke to Mesa Boogie and Euro tubes about a set of tubes with two different ratings. They both told me that they don't recommend a mixed set. I was surprised they didn't. Do...
  8. S

    MK 2C+ Class A question

    I have a MK 2C+. (100w simuclass) I've just recapped the amp. Using a bias probe I was measuring the plate currents of the outer pair of 6l6gc's. I put the rear switch is in the "class A" position. With no signal on the input the idle current is about 48ma with 460vdc on the plates. As the input...
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