2. amps-preamps
  3. 1132847783

Help troubleshooting amp

Hi,
When I turned the system on this morning in anticipation of a long holdiay of music there was no signal in my right channel. I first checked all connections which were fine and then I subbed in a pair of replacement tubes for the right side of my preamp, still only on channel. I then switched my attention to my amp, I switched both pairs of 6550's from left to right. Now no signal in either channel! This leads me to beleive that the trouble rests with the amp. I'm going to try switching 6550's back again but one at a time to see if I at least get the left channel back. Regardless I'm pretty sure it's a tube issue but if anyone else has any ideas I'm listening. Why do these things only happen on weekends and holidays?
128x128jond

Showing 2 responses by musicslug

musicslug
430 posts
 
you haven't told us what type of amps you have but...
on my Cary SLAM-100's there are TWO fuses per monoblock - one's just for the tubes and I forget what the other's for - and I have had situations where one of them blew and there was no sound but the tubes still lit up fine.
musicslug
430 posts
 
sometimes, if the break in the fuse is tiny, you need a magnifying glass to see it. assuming you have spare fuses on hand, simply changing them will be a diagnostic if you're stumped. as I said, my monoblocks have two fuses per side, and one of the fuses can be blown (resulting in no sound) while the tubes still light up.
More to discover