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Old 30th March 2010, 02:41 PM   #7571
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The voltage rating on those caps is a bit tighter than I would like:. If there were 35v ones you'd be better off...


Fran
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Old 30th March 2010, 02:48 PM   #7572
udailey is offline udailey  United States
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They would be good for something like the MiniAleph. Can you imagine 500,000uf for $21? Of course you still have over $100 of caps left over More Minis!!
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Old 30th March 2010, 06:27 PM   #7573
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Quote:
Originally Posted by woodturner-fran View Post
The voltage rating on those caps is a bit tighter than I would like:. If there were 35v ones you'd be better off...
25V rated caps in the stock F5 seems to be OK with Mr Pass.
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Old 30th March 2010, 06:31 PM   #7574
labjr is offline labjr  United States
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Quote:
Originally Posted by steve jones View Post
25V rated caps in the stock F5 seems to be OK with Mr Pass.

Those are Panasonic Caps. I wouldn't trust every brand.
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Old 30th March 2010, 06:33 PM   #7575
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Looks like a '93 date code to me...

I got 10 of these (price break at 10) from Digikey:
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Old 30th March 2010, 08:28 PM   #7576
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Since I'm building four channels I'm looking for 16 of something. As usual, I think capacitor choices would cause much debate. Peter (the infamous one ;-) uses Jensen four-pole which are worth a small fortune. On the flip side of that coin we see some decent regular caps in the sub $10 range. I, just for the hell of it, may squander my kids inheritance ;-) and try Mundorf's Mlytic Audio Grade.

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Dan
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Old 30th March 2010, 11:33 PM   #7577
Tea-Bag is offline Tea-Bag  United States
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Dan,
I would personally go for the 470000uf panasonic one's on Ebay.
2pcs Panasonic Radial Capacitors 47000uf 25v 85C - eBay (item 200449742234 end time Apr-12-10 09:54:46 PDT)
I've bought other stuff from this guy before. Quick service.
I use 4x 47000uf Panasonic's in my F5. Under load, the are 22.5v on V+, at least on mine.
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Old 30th March 2010, 11:49 PM   #7578
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Quote:
Originally Posted by Tea-Bag View Post
Dan,
I would personally go for the 470000uf panasonic one's on Ebay.
2pcs Panasonic Radial Capacitors 47000uf 25v 85C - eBay (item 200449742234 end time Apr-12-10 09:54:46 PDT)
I've bought other stuff from this guy before. Quick service.
I use 4x 47000uf Panasonic's in my F5. Under load, the are 22.5v on V+, at least on mine.
Purchased. Hard to ignore good advice. They look like they fit on my PD universal PS boards.

Thanks for the advice.

Regards,
Dan
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Old 31st March 2010, 01:14 AM   #7579
cjkpkg is offline cjkpkg  United States
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OK,

Up and running...Peter's PSU, and F5 boards, Dale CMF50 and Panasonic resistors, PSU is 4X22,000 uF 35V caps with 4X panasonic .47, JFETs are Blues toshibas, and MOSFETS are IRFP244 and IRFP9240.

Lastly which may lead me to my answer is the xformer which is an antek 300VA 18V unit.

I am currently running R11/R12 at 800mv and the heatsinks are HOT but I can touch them for a good 15 sec before I need to let go. DC on the speaker terminals is minimal - 10mv at best. I am reading 5.25V across R3/R4 on both channels

I have all current limiters and thermistors installed.

While the amp is dead quiet and am disappointed at the power. Honestly my aleph mini seems to pack more punch - at an anemic 13.5V rail voltage.

The rails on the F5 are running 22.6V tonight.

Any ideas where to look next? I am already considering either A-purchase a duplicate xformer or buy the 400 or 600VA unit.

thoughts?

Click the image to open in full size.

Last edited by cjkpkg; 31st March 2010 at 01:20 AM. Reason: added pic
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Old 31st March 2010, 01:23 AM   #7580
labjr is offline labjr  United States
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You power supply seems a little wimpy. Get the 600VA Antek. And add more capacitance too. Make sure the bias is where it should be.
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