I've been having problems with one of my Urei LA4's, low level distorted output. Someday I hope to be knowledgeable enough to test around and isolate the problem, then fix it. For now I am limited to popping the lid and sniffing for burnt out resistors. Yep. Smells funny. Hope it's not the optical element causing the problem.
I'll have to take it in to get fixed. (It's the single one in the picture - the one with the black mains transformer)
Tangible Technologies has some interesting mods available for LA4's
http://www.tangible-technology.com/optical/LA4_article.htm
Also great reading is this article about caps
http://www.tangible-technology.com/audiobasics/upgrades/upgrade1_opamp_cap.htm
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