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In Reply to: Many reasons. Among them deterioration of the large power posted by HenryH on April 29, 2007 at 04:27:04:
I used a pair of Kenwood L-07M monoblock for about a year or so, late 70's vintage, all stock including the large PS resevior caps, sounded fantastic.Wonder how long they'll be out there making many modern amplifiers sound like junk before they decide to break down?
Follow Ups:
Like many months or even years.
Henry
I can understand that if an amp hasn't been used for some months/years, it takes a period of "running in" playing music, before it sounds its best ... but I wouldn't have thought that the period of non-use actually degraded it?IE. after this "running in" period, the component would sound just the same as it would've, the day after it was turned off (if it hadn't been turned off!!)??
Regards,
is hard on the power supply caps. That is, once charged, allowing the unit to sit for extended periods is harder on it than regular routine use.
I can only relate one example of this. I had an Eico tubed integrated amp that I used a bit, then stuck in a closet where it sat for several years. I brought it back out and the second time I turned it on it popped loudly after 10 minutes or so. Scared the bejeebers out of me.
This was repeated several times, the last time before a tech friend of mine who immediately said it sounded like one of the PS cans arcing between sections. Having no way to determine which cap, I replaced all four as they were not expensive. That cured the popping.The tech said that these big caps lasted longer when properly "exercised."
Henry
While it is possible for a capacitor to hold a charge for a long time, I would think that a well designed circuit would provide a discharge path for the power supply filter caps when shut off. In fact, there was at one time a FCC regulation that required televisions to utilize a bleeder resistor for this purpose.
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