Metropoulos Forum

100ohms resistor to ground on each side of the heater wires would do the trick?

2watt?

Yes!

0.5 watts are enough, because nearly no current there.

Larry

Thanx Larry

novosibir wrote:Yes!

0.5 watts are enough, because nearly no current there.

Larry

I've heard from a reputable tranformer maker that using the .5 watt 100 restistor can work better than a fuse in some cased of power tubes shorting out.

scottosan wrote:I've heard from a reputable tranformer maker that using the .5 watt 100 restistor can work better than a fuse in some cased of power tubes shorting out.

That's right in that cases, when due to a bad or dirty tube socket any pin 3 (plate) is arcing to pin 2 (filament). If the amp doesn't have a H.T. fuse, the resistors are burning open and disconnect the way to ground, hopefully before the OT's primary burns open.

After this has happened, the amp has a huge amount of hum and then you'll know, that these resistors are fucked up - and of course one of the output tubes.

But - a H.T. fuse always is better than trust on these resistors!

Larry