| Author | Message | ||
     Brian Sodergren |
Got a friend of mine that has a 41HD-130 (Serial# D006492 chassis 2275-130-UL) that's kind of on the fritz. It's fine till it gets hot and then it looses the highs (Had to drop the mids to 0 and the bass to about 4 with the highs cranked to 10) and starts popping/cracking and fading in and out. After a while it just cuts out completely. The tubes were replaced with new matched Sylvania's about 3 years ago, but he's wondering if it's been goofy all along. I thought maybe the power transformer was going on it. But then again I'm no where's near being an amp tech. Kinda like to find out what's wrong with it because I may be getting this amp sometime here in the near future. He prefers his '65 Twin, but I love the way my Tele sounds through the MM! Thanks for any help you can offer. | ||
| Paul |
Brian, This could really be a number of things. I really don't believe that it would be the power transformer. Heat related problems are usually resistors, capacitors, solder joints, or power tubes. Boy, doesn't that one cover alot. If you're not an amp tech type, I would *not* recommend getting into the internals, due to the high voltages found inside. If these problems are not intermittent, it would easy for an amp tech to fix this. An easy test that you could do though, would be to plug in the older set of tubes, depending on how bad they were and similar they were to the new set, and see if the problem still happens. Good Luck, Paul | ||
| Brian Sodergren |
Thanks Paul, No need to worry bout me stickin my pudgy lil fingers in there...I've been tagged with a jolt before although not from an amp. I'll see if he still has the old tubes and try that. He's trying to avoid going to the shop with it as the guy charges $35/hr for diagnostics and tends to be a little heavy on the time slip if you know what I mean. | ||
| michael kaus |
You might try re-tensioning the tube sockets and visually looking for broken/cracked resistors around the sockets. Also, bad/cold solder joints are a distinct possibility. The tube sockets would be my first look though. Mike. |