Hi all, been a while since I've posted here, but always looking at the many builds and threads.
I have a small 15watt tube amp which has been great until it stopped working. No sound
the tubes are 2 - 12ax7 and 2 - EL84's - amp =(Stauss SV TNTB chinese make)
The amp powers up and the tubes all glow ( I have noticed that one of the 12ax7's glows on one side only. I belive there are 2 filiments in each tube and this is possibly the problem)
I have checked the fuses which appear good.
I have some mesa boogie tubes on the way both the 12ax7 and el84.
Now I have learned a little about the need to 'bias; the tubes correctly.
It's probable that this amp is cathode biased meaning i can change tubes easily.. I think
My main question is can any of the amp gurus establish if my amp is actually cathode biased from the photo below?
Reply With Quote