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Old 1st February 2012, 09:44 AM   #921
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thank so much!
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Old 2nd February 2012, 10:17 AM   #922
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One would have thought that a voltage regulator with very low noise would not worry too much about its smoothing caps. Well it isn't so. I initially used some fairly cheap but serviceable Panasonic 10,000uF TS-HA caps. Listening to the BA-2 with these in the regulator for the front end I was initially pleased with the overall clarity improvements, however, turning to some of my favourite music such Healy-Hutchinson carol piece I was struck by the lack of comfortable warmth and the rather flattend perspective of the orchestra. Could it be the caps. I had a nagging feeling I should have used my favourite Mundorf AG in the first place but how could caps this far back from the output make such a difference? Out went the 10,000 and in came the 4700uF Mundorfs. Well the difference is very significant. Flattened soundstage and I have to say somewhat flattened musical images have much more depth. Strings now can be heard with more warmth and depth positioned more clearly behind the brass for example. Could it be 10,000 to 4700uF made the dirrerence. Well possibly but I have noted the characteristic of these Panasonics before and for me they don't sound as good as the Mundorfs, which is a shame really because they are a lot cheaper.
Chris
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Old 2nd February 2012, 10:29 AM   #923
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Panasonic caps lack some bass & warmth but are good in mids & highs + very reliabable. I don't know the Mundorfs AG but it's boutique and "dressed" for audiopurposes, so us the price My experience is if big caps aren't needed don't use them, more speed and less heavy sound. What about the burn-in proces, did you gave the TS-HA time for that ?

Caps are like spice to me.

Last edited by acidbrain; 2nd February 2012 at 10:31 AM.
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Old 2nd February 2012, 10:33 AM   #924
AndrewT is offline AndrewT  Scotland
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Did you check the PSU rail stability before and after the mods?

Did you check the amplifier stability before and after the mods?
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Old 2nd February 2012, 10:33 AM   #925
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Yes, plenty of burn-in time. The Mundorfs don't always do it for me. I tried a 10,000uF 25V on several projects and it always sounded constrained, lacking the usual openess I associate with Mundorfs.
Yes, there is something addictive abouts caps.
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Old 2nd February 2012, 10:34 AM   #926
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Quote:
Originally Posted by AndrewT View Post
Did you check the PSU rail stability before and after the mods?

Did you check the amplifier stability before and after the mods?
Can you take me through those steps please Andrew?
Chris
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Old 2nd February 2012, 10:40 AM   #927
AndrewT is offline AndrewT  Scotland
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Stick a scope on the power rail.
Start applying some horrible signals to the amplifier. Does the PSU rail react?
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Old 2nd February 2012, 10:55 AM   #928
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Horrible signals to the amp--are we talking Stockhausen--and what is the reaction I should be looking for on the scope?
Chris
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Old 2nd February 2012, 10:58 AM   #929
AndrewT is offline AndrewT  Scotland
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Loud music or quiet squarewaves, or loud filtered squarewaves or etc.

The PSU should show a tiny rounded sawtooth ripple at quiescent.
This ripple should increase in value, but not in shape, as the output current goes up towards maximum.
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Old 2nd February 2012, 07:53 PM   #930
alazira is offline alazira  United States
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Quote:
Originally Posted by Backbones View Post
One would have thought that a voltage regulator with very low noise would not worry too much about its smoothing caps. Well it isn't so. I initially used some fairly cheap but serviceable Panasonic 10,000uF TS-HA caps. Listening to the BA-2 with these in the regulator for the front end I was initially pleased with the overall clarity improvements, however, turning to some of my favourite music such Healy-Hutchinson carol piece I was struck by the lack of comfortable warmth and the rather flattend perspective of the orchestra. Could it be the caps. I had a nagging feeling I should have used my favourite Mundorf AG in the first place but how could caps this far back from the output make such a difference? Out went the 10,000 and in came the 4700uF Mundorfs. Well the difference is very significant. Flattened soundstage and I have to say somewhat flattened musical images have much more depth. Strings now can be heard with more warmth and depth positioned more clearly behind the brass for example. Could it be 10,000 to 4700uF made the dirrerence. Well possibly but I have noted the characteristic of these Panasonics before and for me they don't sound as good as the Mundorfs, which is a shame really because they are a lot cheaper.
Chris
Hi,
From my own cap-swapping experiments:

The 10,000uF (mundorf AGl, nichicon KG) sounded better than their corresponding 4700uF or 6800uF versions.

My favorites:
1) Mundorf AG
2) Panasonic TS-HA
3) DNM/BHC 2 pole slit foil (very smooth warm sound; many will prefer this)
4) Nichicon KG
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