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I'm not sure if this is the appropriate place for this but here goes. On the SS Ref 500's they use a couple of 300 ohm 5 watt resistors and a couple of 15 volt 5 watt zener diodes to take care of regulation for the preamp section. I've found that replacing this stuff, which runs hot and fails, with a couple of regulator IC's (7815 and 7915) can add reliablity too this unit. Place them next to the last row of output devices near the place where the old parts were located. wire them into the supply voltage right there. I found that placing one of those thin rubber heat sink pads above the two devices will get decent heatsink pressure even though there isn't a hold down bolt right next to them. Also check the toroid since these seem to have the same problem with chafing taking the enamel off the windings and leaving you with shorts. And these shorts can give you bizarre problems to a simple release of magic smoke.
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I've been working on mods for certain SS amps because of their lack of reliablity. I do this so my repairs are reliable. I don't do SS warranty or any other manufacturer warranty work anymore. There just wasn't enough money in it for me. Right now I'm a independant repair tech specializing in amplifiers (especially car) and custom circuit design. (things like mixer boards and variable pitch decks for aroebics instructors) Some are kind of cute
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Techie, have you had an oppurtunity to look inside a Nakamichi amp? I'd be interested in hearing your most expert opinion on the internal workings.....
------------------ http://members.tripod.com/Audiophyle Ba Chomp, Ba Chewy Chomp, Ba Chewy Chewy CHOMP!! Someday, we'll all look back on this, laugh nervously, and change the subject!!
Posts: 3120 | From: nowhere | Registered: May 1999
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