Hi. I'm not 100% sure if I actually have a problem or not. Advice please!
I've just replaced the trio of 12AT7/ECC81 tubes on my ST70 driver board because one failed. The replacements work fine and everything sounds lovely again but........................
..................When I swich the amp on all 3 12AT7/ECC81s glow very brightly, like a light bulb instead of a valve, for a second or so
then settle down to the normal amber glow I'm used to. I don't remember that happening with the valves I've had to replace. Maybe that's why I had to replace them in the first place.
So I'm currently scared of using my system at all in case I blow up another £30 quids worth of new valves.
Can anyone tell me if I have a fault in the amp upstream of the tubes and, if so, wot it is and how to fix it.
p.s. cracking forum. I'd be stuck without it!
I've just replaced the trio of 12AT7/ECC81 tubes on my ST70 driver board because one failed. The replacements work fine and everything sounds lovely again but........................
..................When I swich the amp on all 3 12AT7/ECC81s glow very brightly, like a light bulb instead of a valve, for a second or so
then settle down to the normal amber glow I'm used to. I don't remember that happening with the valves I've had to replace. Maybe that's why I had to replace them in the first place. So I'm currently scared of using my system at all in case I blow up another £30 quids worth of new valves.
Can anyone tell me if I have a fault in the amp upstream of the tubes and, if so, wot it is and how to fix it.p.s. cracking forum. I'd be stuck without it!
