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In Reply to: Help! My amp eats tubes! posted by vacuous on May 24, 2000 at 03:08:22:
Hey, Vacuous:I've got a CJ MV50 too. It shouldn't be doing that. I wasn't having the pyrotechnic displays you were having, but it was going thru tubes faster than it should. I sent it to Bill Thalmann at Music Technology. Only thing wrong he could find with it was the "AC balance was way out of whack". Did his mojo...too early to tell yet if it'll go easier on the tubes, but it's a MUCH better sounding amp-better bass, better dynamics, etc. You ought to call Conrad Johnson, get an RA number, send it in. Bet that the AC balance needs adjusting.
As an aside, I've heard that the MV50 is only really happiest with the NOS fat glass Sylvania/Phillips 6CA7's, so that's what I'm using.
Sure wish I knew where to find some more, or it's gonna have to be Svetlanas for me after these go. Hope this helps. You're supposed to get 2-3 years out of a set of outputs with this amp, with "normal useage".
Yep, the longest lived tubes in my CJ MV50 were Phillips and Sovteks. Had Mullards too, ... for less than a month. But I'm having a problem facing reality here... I can't visualize sending my amp 5000 miles to North Carolina in the hands of UPS. I'd really like to find reasonably priced service somewhere in the San Francisco Bay Area where I live. Any ideas? In the meantime, here is a true story. Six years ago I lived in a an apartment building in Berkeley CA which caught fire late one evening. I had seconds to gather my wits and belongings and run out of the building. Next thing I remember, I found myself out on the street in my pajamas with my most precious possession ... my CJ amp. True story!
Try Resistance Repair, 807 Allston Way, Berkeley 841-1459. I have used them over the years. I don't know anyone personally, who works there now, but a friend of mine (I used to work with him 35 years ago fixing tube amps) worked there until recently.
...
It's a long journey from where you are, but Resistance Repair in Berkeley has the reputation of being the best around.John
LOL! I understand perfectly. Also understand why you wouldn't want to send your CJ on the perilous journey. Mine made it intact, not just once, but twice, as I bought it from a guy who lives close to the CJ factory in Va. Not sure I wanna push my luck for 3rds. Surely there must be SOMEbody in a metropolis the size of SF who can help you...try calling a CJ dealer, and ask who they use. I guarantee you there's more going on with your amp than just marginal tubes, so I encourage you to get it serviced.
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