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 1 response by scifi

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scifi
67 posts
 
I had the same problem with my VTL MB450's. A bad tube blew the main output fuse on one of the amps but the tubes themselves still lit up because there was a small amount of current going through them. The fact that there was current going through them mislead me to thinking that the problem was not the tubes.

I would agree with Jea48 that a bad tube on the right side when switched to the left side blew a fuse on the left side as well.

I would check the fuses (use a volt meter) on this amp to see if indeed they are blown. If they are, you need to replace the fuses and the tubes before proceeding any farther.

Scifi
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