"Fleetie" wrote in message

"Fleetie" wrote

In new news: My valve amp has gone tits-up this evening. Well, the
left channel has. It's clipping REALLY early. A valve swap from
L -- R for all valves kept the fault in the left channel, i.e.
it didn't change sides, so I'm hoping a resistor in the left side
has burnt or something. PLEASE not a transformer fault.

I can't get the thing open! The screws are too tight!

BUT luckily I can see down onto some of the PCB if I take the
output valves out. Sure enough, there's ONE blown-up resistor
visible in the left channel. Not a small one, but not huge.
I'd guess it's rated a watt or two.

I guess it's a cathode resistor but I can't tell, cos I can't see
much of the PCB.

Anyway, it's Orange Orange Gold Gold. I can't remember what a
Gold multiplier means. 0.1 or 0.01? I'll look it up anyway.

Gold = x 0.1

So it's either 3.3 Ohms or 0.33 Ohms.

That would be a 3.3 ohm resistor.

I'm quite happy cos I suspect and hope that it's be an EASY fix
and I'll be back to divine sound again soon!

When a part like this burns up, its probably for a reason. IOW it didn't
burn up because for its own reasons - something else in the circuit dumped a
whole lot of current through it.

If you want more *engaging* treble from that SS amp, pick up two more 3.3
ohm power resistors when you pick up the replacement for the part in the
tubed amp. Put one in series with each speaker's hot lead.