Jeff or Anyone 4212 Tube Question

[Amazing Len]

Had a 4212 Tourmaster combo for about 2 months now. Started hearing tube crackle and noise at a gig last night.

1. Amp is only about 2 months old. Are the tubes covered under warranty?

2. What do I put in there that would require no biasing? I am no technician!

Thanks guys!

 

[Jeff Hilligan]

john@egnateramps.com will supply you with new tubes. Sounds like a pre amp tube. Not sure which one, look on page 17 of the TM manual. It gives pre amp tube layout. Is the crackle on all channels or just clean or dirt. That will make your changing out of the tubes easier via the manual.

 

[Amazing Len]

Couldn't really say about channels. I hear it when I start the thing up, which is channel 1. When I was playing the other night it started distorting on a clean channel for a few seconds, but then it cleaned up. That could have been a cable or an effects box. I'll fool around with it, look at the manual, and contact him. I also think it is the pre-amp tubes, although when I was playing the other night I wasn't getting a lot of juice out of the distortion channels- the clean channels were a lot louder. I do have effects running through the effects loop and I am still fooling with that setting- that might have had something to do with it. The whole thing was louder when I cut the loop out.

Thanks!

 

[Buckeyedog]

Dude, cut out everything.......just use guitar/amp and test it out. Make it simple first. Likely a pre amp tube though.

 

[Len Rabinowitz]

That's what I have been doing this morning and so far no noise! My sense is that it is a preamp tube. My sense is that the other stuff is some kind of gain-staging issue. Between the amp and the effects there are so many gain staging possibilities it is mind-boggling. Look at my signature- trying balance all of that stuff can give me a headache!