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Reverb/Ringing in Leach Amp
Reverb/Ringing in Leach Amp
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Old 6th November 2001, 08:52 AM   #11
pjkunz is offline pjkunz
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Join Date: Oct 2001
Location: Palo Alto, CA
Smile Success with new caps

I O'scoped the system as a whole

Leach Amp
Siver Sonic T-14
PSB Century 400

and saw no obvious indications of ringing/oscillations/etc.
(I also checked on the power supply)

so I removed all of the orange drop caps and replaced with much smaller panasonic ECQP polypro and ECWF Met.Polypro.

These also are nothing fancy, but this has made a significant change for the better, female vocals are significantly more 'up front'. In general the sound is much less irritating. So I don't know if the improvement is simply due to the change in caps, or if by changing them out I eleminated the long lead-lengths and stiffened the attachment. (As I mentioned the orange-drop were too big for the board layout). It could also be a little bit of both. In any case things are that much closer to fine. Of course things will never be perfect, otherwise I'd be out of a hobby!

Is it typical for a simple swap of primarily bypass caps to have such a strong impact?

Thanks again to all who offered advice. It has been greatly appreciated and I can only hope to return the favor.

-Pete Kunz
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Old 6th November 2001, 09:17 AM   #12
ppl is offline ppl  United States
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Location: Seattle, WA U.S.A.
This could be the result of both. But like i stated IMHO orange drops are not good and i dont see what so many High End Audio people see in them.
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Old 6th November 2001, 06:24 PM   #13
Nelson Pass is offline Nelson Pass  United States
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Reverb/Ringing in Leach Amp
I've had excellent results with the Panasonic
polypropylene caps, and of course they're easy
to get from Digikey.
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