Tube Amp Archive

The problem is, I now have no output from the amp at all. It's as though the power is turned all the way down. I've noticed that my Hall VVR3 board has a place on it for a resistor that isn't mentioned in any of the instructions I've managed to find. I couldn't get a reply from anyone at Hall Amplif...

The main mosfet is on a heatsink on top of the chassis.

I mounted the board within the chassis but had to fit the pot remotely as it's all a bit cramped.

I've finally got this fitted.[/img]

Don't worry Tom, I plan to insulate the Mosfet's legs with heat shield.

Thanks to all for the tips. I think I'll go for a heatsink similar to that finned one in the last reply as the chassis on these amps is pretty cramped and I want reliability.

Thanks guys.

Ampgeek - were the chassis you installed them in aluminium? Mine is shell, which obviously doesn't conduct heat as well as ally.

Thanks Steve. I think I'll play it safe then, and mount the heatsink and Mosfet on the top of the chassis so it gets some decent airflow.

Hello. I want to install a Hall VVR3 board in my Selmer Treble & Bass 50. My question is, how hot does the large Mosfet get? I've ordered a ally heatsink for it but if I install inside the chassis, where all the amp's guts are, will it get enough airflow? Or do I need to mount it on top of the chass...