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In Reply to: RE: Biasing Proton AM-300 integrated amp? posted by mjcmt on March 20, 2015 at 13:01:11
Interesting. Just this week my brother called me (lives in another state) saying the Proton receiver I helped him install in his with his flat screen TV to play outboard speakers had developed a low frequency hum. It was the AI-3000 II with the built in CD and cassette player.
Knowing the unit was about 25 years old and had never been serviced my guess was at the very least out of spec electrolytic caps but possibly more. Rather than spend money on a repair I suggested he simply replace it with a new, modestly powered 2-channel receiver. He found one on sale for less than the Proton repair would likely cost.
Now for those able to make repairs themselves anything as old as the Proton would likely have been worthwhile fixing. But for those unable to do it themselves I don't believe vintage electronics, unless it was something like a Mac, Marantz, Fisher, H-K Citation, etc., would be worth the expense.
Anyway, good luck adjusting/repairing yours if you're able.
"You can't know what the "best" is unless you have heard everything, and keep in mind that given individual tastes, there really isn't any such thing." HP
Follow Ups:
I do my own repairs, but on a unit like that, there is too much going on under the hood for me. I would pass. There is nothing wrong with it, but with all those functions crowded in there, it is hard to work on them.
Dave
Mine actually works perfectly and has been in storage for a few decades. I have original box, packing, manual, warantee card, and most importantly remote. I just want to make sure the idle bias is set to factory specs.
mjcmt, I'm sure many Inmates here know far more about electronics than I do, and you may be among them.
But I've been reading warnings about older electrolytic caps from knowledgable people for years. Some say they should be replaced after about 12 years, others around 15, and a few suggest longer may be possible. But given the age of your Proton why not replace all the electrolytics if you're going to pop the hood anyway? OK, it may play now but what level of performance and for how much longer?
"You can't know what the "best" is unless you have heard everything, and keep in mind that given individual tastes, there really isn't any such thing." HP
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