ax84 simple preamp B+ voltage ?

[petemoore]

  What is suggested by B5 ? what voltage would that be.
  I'm running at 165Vdc, and have a 33uf/450V filter capacitor for the B+ of the two gain stages [11k5 on one cathode, 2k2 on the second] 100k plate resistors to B+.
  Add a .1uf DC blocking capacitor to the input grid.
  I've searched for days as Ax84, and tried everything to be able to post there or see if -non logged in viewers are forbidden to see the power supplies that go with the partial schematics there.
  @@ Rate, I'm trying to get the hum from the preamp.
  both signal jacks are isolated, the only shared ground is the input jack and the shielded wire.
  The heater supply was batteries and same noise as the PS, so I assume the noise isn't to do with the regulated PS I'm using.
  There isn't much else to it, most of the wires aren't long, and the PS is to the left, tube in the middle of a long chassis, 1 star ground, all grounds are run separate. 
   

[sonbone]

Have you looked at the tube amp debug page at geofex?

http://www.geofex.com/ampdbug/hum.htm

[petemoore]

  Yes, I have.
  The hum-balance knob [normally the volume knob] completely [almost...real nice 'n quiet], eliminates noise floor, a sweet boost sound, perfectly usable as-is.
  But the volume control should work like a volume control.
  And there it is...one lug ground, one lug from stage 1 output capacitor, wiper to grid of second stage...simple yet difficult.
  Seen clearly and cleanly, also measured...I measured 0.0Vdc before and after the volume knob with the amp on and so I believe the capacitor is good and grid blocks DC on the pot output, no input DC blocking cap shown on second stage input.