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Old 29th April 2003, 04:45 PM   #21
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If you would buy Krell and later built a Gainclone, chances are you'd be using Krell as a nice stand for chip amp.

http://www.sakurasystems.com/show/chrissystem.html
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Old 29th April 2003, 05:45 PM   #22
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Default Re: Gainclone Cap Survey

Quote:
Originally posted by PaulHilgeman
How much do you use?

What Brand?

What is your supply voltage?

What is the impedence of the speakers you drive?

Thanks!

-Paul

66,000uf per voltage rail

dont know, some cheap ones i got out of a power supply

+/- 15v at present, i am building a +/- 30v one at the moment

8R
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Old 29th April 2003, 08:25 PM   #23
Nuuk is offline Nuuk  United Kingdom
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Panasonic FC caps; 120's in the PSU and 1000's on each rail on the chip pins. (1000's are bypassed by .1ufd polyprops.)

Very happy with sound but will experiment further. That's half the fun with these amps.

25-0-25 transformer (120VA) provides +/-36 volts on the rails.
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Old 29th April 2003, 09:17 PM   #24
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Quote:
Originally posted by Peter Daniel
If you would buy Krell and later built a Gainclone, chances are you'd be using Krell as a nice stand for chip amp.

http://www.sakurasystems.com/show/chrissystem.html


BWAAAHAHAHAHAHA! That is TOO funny.
Now I know I have to build one of these and see what the fuss is all about.


Carlos,
10000F would be the minimum I would expect to see with a p/p class AB amp. I can't argue with listening tests, but it does surprise me that everyone is using so little capacitance! I guess i will have to find out for myself.
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Old 29th April 2003, 09:22 PM   #25
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Default Why not simply having the best of both worlds?

When it`s true that a Gainclone amp sounds best (above the bass range) with only 1000F rail filter cap, IMO the obvious next logical step would be an active multiamp system (especially as those chips do not cost more than good passive filter parts) with seperate rectifiers and 1000F cap for the mid/high amp(s) and some "normal" cap values for the bottom range amp(s).
Or in a threeway system let`s say: 1000F/tweeter-amp; 3300F/mid-amp; 10000F/woofer amp.
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Old 30th April 2003, 12:57 AM   #26
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Default krell for parts?

bet that krell stand has lotsa good caps in it (grin)
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Old 30th April 2003, 09:36 AM   #27
protos is offline protos  Greece
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I went from 4700uf caps on the chip to 2x680uf BGN super -E configuration. So less is more in my case.Bypass on the bridges with 2,2uf polycarb and 0.1uf tin and foil was best combination at least for me.
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Old 30th April 2003, 10:58 AM   #28
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Talking Hot stand

[QUOTE]Originally posted by Peter Daniel
[B]If you would buy Krell and later built a Gainclone, chances are you'd be using Krell as a nice stand for chip amp.

Oh, man, that would be a hot stand!
I won't buy a Krell, because I don't have the money.
But I was thinking on trying something like cocolino suggests, I had thought of something similar.
Maby even bi-amp with LM3875s for the tweeters and LM3886 for the woofers.
Deam it, the mail system guys here in Portugal are on strike, I'm waiting for my transformer for a week!!!
One channel is ready and no transformer.
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Old 30th April 2003, 12:00 PM   #29
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Quote:
Deam it, the mail system guys here in Portugal are on strike, I'm waiting for my transformer for a week!!!
I understand, my Digikey order is currently taking a tour of Canada courtesy of Purolator
based on the tracking info the package was in a depot just a few miles away before this tour started
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Old 30th April 2003, 12:43 PM   #30
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Talking Bypass, bypass, bypass...

Quote:
Originally posted by protos
I went from 4700uf caps on the chip to 2x680uf BGN super -E configuration. So less is more in my case.Bypass on the bridges with 2,2uf polycarb and 0.1uf tin and foil was best combination at least for me.
Protos, man, try to put the 4700uf caps back, and bypass it with, say, a 10uf electrolythic and a 0.1uf poly (or even ceramic!).
If you prefer, you can forget the 10uf cap.
You may be surprised.
I think people shouldn't use a big cap alone.
The better results you had with the 680uf caps are because they are faster and have less resistance.
But just try to bypass the big ones.
My first channel is done that way (with 1000 uf caps, for now), but the deam transformer doesn't arrive!...
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