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This amp has been serving me well for years now, and I just love it. One tube on the left side went dark a few months ago (the front tube in the attached photo). I replaced the dark tube with one from a set of 4 that I purchased from Antique Electronic Supply. With the new tube in place, when the amp was turned on, within 15 seconds I saw smoke coming from below the tube, which freaked me out! I cut the power and returned the faulty original tube. Since then the amp still works pretty damn well, thankfully, with only a tiny bit of noise on the left when not playing music. I ordered a new JJ Electronic E34 tube from Antique Electronic Supply (still in the box shown in the photo). Do you think I should try it again with the new tube? Or does it require replacing all 4 on the left side with a bundled batch of JJs? I assume smoke is friggin catastrophic, but I'm not experienced with these so maybe not?Dan Meinwald is the only experienced technician who did a maintenance service on this amp about 10 years ago, but he's not so available at the moment -- and maybe this is a really simple task. I'm gun-shy after seeing smoke!Your thoughts & recommendations would be greatly appreciated.
Do you think I should try it again with the new tube?NO, after the smoke the amp was damaged.Unplug from the wall and send it for repair.Or does it require replacing all 4 on the left side with a bundled batch of JJs?If the amp have individual Bias you can replace one tube.If the amp have Bias in pairs of tubes you can replace tubes per pairs(matched pair).I assume smoke is friggin catastrophic, but I'm not experienced with these so maybe not?The smoke was a resistor or capacitor die out.How is the Bias in this amp ?
Thanks FullRangeMan.... This amp is self-biasing.
I would not mess with it, just send it in to a repair facility.BTW - I used to own that amp and when I decided to try different tubes, Tim recommended KT77's. Check out the Gold Lion brand.
Thx RPM123. You're right, of course. Why should I take any chances on a piece as great as this one--especially when I'm not feeling 100% confident to DIY it? I'm in Southern California. You wouldn't have any recommendations of repair shops around here would you? (Other than the great Dan Meinwald, that is.) As for KT77s... I'll start reading up on those. That's a heavy endorsement; from Tim himself.
I don't know of anyone by name. i would contact Upscale Audio and see if they have a recommendation.
el34 and kt77 are interchangeableyes i agree with others, send the amp to a qualified technician for check out and repair before trying to put new tubes in to useif the amp was smoking it has definitely sustained damageif you are in socal, george meyer av in downtown los angeles is a very qualified repair shop, does factory repair for many top hifi brands
I'm in Northern CA, so I don't have any recommendations near your location. Doesn't EAR have a repair facility in Southern CA, other than Dan?
Hi RMP123... I misspoke earlier. Dan is the EAR dealer, but the service work was done by Mitch Singerman per Dan's recommendation. Mitch isn't as available now as he was then.BTW, did you sell your EAR 534 about 15-20 years ago via audiogon? I may have your amp. I got it second-hand and it was from N. Cal.
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