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oh test the B+ at the plate cap with the plate cap OFF and the tube out of the socket. with no load it should be very high, not a great test if you are getting some HV but a starting point. Really a better test for no HV.
HOT screen voltage will tell you a lot. tube 6CB5 pin 1 or 8 (screen) should be 172vdc, pin 3 or 6 (cathode) should be 7.5v and pin 4 or 5 (control grid) should be -40v
for testing the SHUNT TUBE you can siimply disconnect the 6BK4 plate lead (keep it clear of any ground, this will have FULL HV on it so be careful. disconnecting it will clear the shunt tube as a problem (if the HV comes back that is).
Last edited by DaveWM; 10-12-2012 at 11:49 AM.
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