Interesting find with my 545II when hooked up to my three way speaker pair.
About five seconds following shutdown, the amp gives a very faint squeal through the left channel and about one second later the right channel exudes a slightly louder "squall" such as a tonearm stylus being drug slowly over an album,
Nothing loud or damaging but consistent.
The kicker, when my Polk speakers are substituted the issue disappears.
Only this particular amp has the issue with this set of speakers.
One modification to the three ways was changing the 10% Electrolytics to 1% PMPC caps. The enclosures both measure 6.85 ohms, sound very good and check out flat with an SA3050.
Just a quirk, weak component?
Lend me your thoughts.
About five seconds following shutdown, the amp gives a very faint squeal through the left channel and about one second later the right channel exudes a slightly louder "squall" such as a tonearm stylus being drug slowly over an album,
Nothing loud or damaging but consistent.
The kicker, when my Polk speakers are substituted the issue disappears.
Only this particular amp has the issue with this set of speakers.
One modification to the three ways was changing the 10% Electrolytics to 1% PMPC caps. The enclosures both measure 6.85 ohms, sound very good and check out flat with an SA3050.
Just a quirk, weak component?
Lend me your thoughts.
My Leach started doing this.
I changed the 100µF on the front end, and the 22µF on the output stage, left the computer grade main filter caps alone, and it quieted right down, the bass got tight again (I also changed the cap in the feedback loop).
I've added main filter bypass caps to other brand amplifiers that were making this noise and they quiet right down.
"Nothing to worry about. "
Your tweeters may tend to disagree.
I changed the 100µF on the front end, and the 22µF on the output stage, left the computer grade main filter caps alone, and it quieted right down, the bass got tight again (I also changed the cap in the feedback loop).
I've added main filter bypass caps to other brand amplifiers that were making this noise and they quiet right down.
"Nothing to worry about. "
Your tweeters may tend to disagree.
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