AC15CC1 hum

[Valvehead]

I have this amp up and running and it sounds good except for a low hum . Its not any of the tubes. This is with master vol on 0. .some parts are new in the ps. Ill post a scem with the new parts / tested parts highlighted in yellow . Voltages in this area test normal . Also posting a video of the hum . D:\Guitar\Mods\AC15CC1_Schematic.pdf

any ideas???

[Valvehead]

vox vid

[Jon Snell]

I would look at pin 3 of the EL84s. Monitor the voltage.
If you remove the phase splitter, does the hum stop. If not, I would suspect a faulty EL84 bias as it sounds like either the main smoothing is not coping with the current draw or one valve is unbiased causing a ripple effect on the output transformer.