WAD Phono II problem

[KennyK]

Hi All,

I'm trying to troubleshoot a problem with my WAD Phono II, which has been long upgraded with various boutique resistors/capacitors, and many PCB tracks have been hard wired for around 15 years

What started as a slight channel imbalance has got worse with the Left channel now virtually inaudible, so I've finally had a poke around with a meter.

I've got a couple of Low voltages on V3 Anode (pin 1) and V4 Cathode (pin 3) which are both stablising at 37v instead of 120v. On power up V3 pin 1 starts at 120, but as the heaters warm up the voltage pulls low. V3 Cathode (pin 3) seems high at 1.6v

The HT seems fine. without the Pre II connected, it's sitting at 270v instead of 250v
Any suggestions where to look?

Thanks
KennyK