Time for a scope ( with > 500V probes) to look for that actual rectifier of the B+.lagwil wrote:Nope but I do have a 5U4GB and exactly the same resultat with that rectifier. Alao swaped all EL-34 Tubes. Same...
The midpoint red-yel should be grounded, the red wires connected with the
gz34 at pin 4 and 6 should be examined for symmetrical voltages. At pin 8 of gz34
look for the 435V and the pulsating peaks from both sides of the rectifier.
The humming transformer indicated unbalance from DC magnetizing , as if one side
of the rectifier don't work.