Sikorel or Silmic for gainclone?

sharpi31 · 22nd March 2007, 07:52 AM

Sorry - it's another capacitor question!

I have 1000uF 50V Silmic ARS caps and 470uF 35V Sikorel 125 that I could use in my next 'compact' gainclone?

Anyone compared these two options? I would use double up the Sikorels to give me 940uF per channel per rail.

Thanks in advance....

Nordic · 22nd March 2007, 08:21 AM

Sikorel in my books, don't think you can easily beat them in slew rate.... but the PRICE!!!!!!!!!!!

I have heard people who didn't think they were THE best sonicaly.

But I don't think it is a dealbreaker... The parallel caps will also present half the impedance!!!! Which is good.

Those sikorel's are axial caps though, so your and my idea of compact differs.

sharpi31 · 8th April 2007, 03:09 PM

After reading Bob Cordells views on power supplies, I am keen to try something different with this 'clone'.

I've built the audiosector amplifier boards with 2x 470uf sikorel 125 per rail per channel. No bypass caps or snubbers used.

I have also got a couple of 2200uf sikorel 105 (100V) and am tempted to mount these from V+ to V- on each amp board. This is supposed to offer increased noise reduction on the psu rails, and also allow the capacitance sitting on both rails to ground to provide current during current drain on one rail (as capacitance on the other rail can 'feed' current through the V+ to V- cap to aid the demand on the opposite rail).

Anyone tried anything similar? I posted the results of previous V+ to V- tests previously, though I only tried small film caps and not large electrolytics.

Also, would it help to bypass this cap?

I'm happy to try these options myself, but would be keen to hear of others experiences...

Thanks.

BWRX · 8th April 2007, 05:05 PM

I use a 0.22uF ceramic rail to rail decoupling cap along with 0.1uF ceramic rail to ground decoupling caps in parallel with Panasonic FM electrolytic caps in my LM3875 amp. I probably wouldn't be able to tell a difference if the 0.22uF cap was removed but it is only there to help shunt any high frequency noise.

Either of the caps you're planning on using are nice so I wouldn't get too caught up in which would be better.

22nd March 2007, 07:52 AM	#1
sharpi31 diyAudio Member Join Date: Oct 2005	Sikorel or Silmic for gainclone? Sorry - it's another capacitor question! I have 1000uF 50V Silmic ARS caps and 470uF 35V Sikorel 125 that I could use in my next 'compact' gainclone? Anyone compared these two options? I would use double up the Sikorels to give me 940uF per channel per rail. Thanks in advance....

8th April 2007, 05:05 PM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	I use a 0.22uF ceramic rail to rail decoupling cap along with 0.1uF ceramic rail to ground decoupling caps in parallel with Panasonic FM electrolytic caps in my LM3875 amp. I probably wouldn't be able to tell a difference if the 0.22uF cap was removed but it is only there to help shunt any high frequency noise. Either of the caps you're planning on using are nice so I wouldn't get too caught up in which would be better. __________________ Brian

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22nd March 2007, 08:21 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	Sikorel in my books, don't think you can easily beat them in slew rate.... but the PRICE!!!!!!!!!!! I have heard people who didn't think they were THE best sonicaly. But I don't think it is a dealbreaker... The parallel caps will also present half the impedance!!!! Which is good. Those sikorel's are axial caps though, so your and my idea of compact differs.

8th April 2007, 03:09 PM	#3
sharpi31 diyAudio Member Join Date: Oct 2005	After reading Bob Cordells views on power supplies, I am keen to try something different with this 'clone'. I've built the audiosector amplifier boards with 2x 470uf sikorel 125 per rail per channel. No bypass caps or snubbers used. I have also got a couple of 2200uf sikorel 105 (100V) and am tempted to mount these from V+ to V- on each amp board. This is supposed to offer increased noise reduction on the psu rails, and also allow the capacitance sitting on both rails to ground to provide current during current drain on one rail (as capacitance on the other rail can 'feed' current through the V+ to V- cap to aid the demand on the opposite rail). Anyone tried anything similar? I posted the results of previous V+ to V- tests previously, though I only tried small film caps and not large electrolytics. Also, would it help to bypass this cap? I'm happy to try these options myself, but would be keen to hear of others experiences... Thanks.

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