VVR Placement Advice

[Blindog]

I have my fixed bias VVR 2 board from Dana installed and fired it up for some quick testing.

It's in a '68 Traynor TBA-1, and I’m regulating the whole amp. I have not put in the extra caps and resistors in the preamp yet. It works, but I’m getting some bad hum when I turn down the voltage until I get to about 1/3 on the pot. I suspect it’s where I installed the board. As you can see from the pic, it’s in the hole where the standby switch used to be, but right on top of the power transformer secondary, and near the heater wires. The B+ in and out wires run right through there too.

Can anyone recommend a better place to install the board, and how long can the leads be from the pot to the board? I was thinking about the space in between the output tube and can cap, with the mosfet soldered to the board and the pot where the standby switch is.

Thanks!

Mark