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Anyone have or had an Onkyo M-504 amp? Do caps go bad?

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Posted on November 29, 2004 at 12:49:12
CQ DX


 
My first foray into decent 'mid-end' sounding audio was an Onkyo M-504 amp I purchased new back in the mid 80's. It's the one with the huge, glowing green dual wattmeters on the front. I've used it the last few years not as a main audio system amp, but as an amp to power my video equipment's audio output, such as a S-VHS and DVD player. I have not hooked up a Dolby Surround system, but am happy with DVD stereo for now, since it's hooked up to a pair of classic Polk Audio Monitor 10's from the 80's. It still sounds real good, but am wondering if I should replace the large capacitors inside the unit. I have been told that the large power reserve caps go bad after several years, and need replacement. The amp was bought back in 1986, and kept in a clean, temp controlled environment. But it's still 18 years old, and for some strange reason, it is of 'sentimental value' to me, so I want to 'upkeep' it and leave it in my current setup. Any advice regarding capacitor changes would be appreciated. Thanks.

 

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Re: Anyone have or had an Onkyo M-504 amp? Do caps go bad?, posted on December 1, 2004 at 07:17:31
Kristian85
Audiophile

Posts: 835
Joined: January 4, 2002
No, and Yes. All parts in the amp go south in time. But, have the unit checked for spec operation before blowing $$ at it. It's prolly fine.

 

Re: Anyone have or had an Onkyo M-504 amp? Do caps go bad?, posted on December 1, 2004 at 09:10:01
CQ DX


 
Thanks. It still sounds fine, but i've read very general comments on the net regarding 'cap modifications' for the Onkyo 504 and 508. Unfortunately, the articles were not specific in nature. The jist of the information I read basically stated that the caps tend to prematurely go bad after even just a few years in these amps. Just trying to get 'the skinny' on this subject.

 

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