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Old 31st March 2010, 05:23 PM   #7601
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Am i mad to use expensive screw terminal caps 7mohms ESR?
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Old 31st March 2010, 05:54 PM   #7602
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If any body is in need of caps I have several new in box Illinois Capacitor 25V 15,000UF caps. pn# 159LBA025M2ED. I would be glad to sell some for cheap I have a lifetime supply of them. I figured I could build almost all pass amps I wanted to with them (Mini A, AlephX, F2, SOZ, etc).

I really need about 8 IRFP9240 Mosfets. I would be happy to trade some caps if you have spares.


Heres the Link, pdf was just a little too big to attach

159LBA025M2ED datasheet pdf datenblatt - Illinois Capacitor, Inc. - 85C Snap-Mount Aluminum Electrolytic Capacitors ::: ALLDATASHEET :::
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Old 31st March 2010, 06:19 PM   #7603
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Quote:
Originally Posted by Renron View Post
With that much capacitance don't forget the soft-start thermistors, or you'll own stock in a fuse company.

Ron
Thanks Ron, I'll definitely add in the soft-starts. I'm only going to go with 8, just picked up 2 extra.

Does anyone have experience running the TSUP line of caps in an F5? Would they be ok to use, or should I seriously consider using something else?

Thanks,
Thor
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Old 31st March 2010, 08:42 PM   #7604
Zen Mod is offline Zen Mod  Serbia
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they're certainly more than good enough
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Old 31st March 2010, 09:10 PM   #7605
cjkpkg is offline cjkpkg  United States
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Quote:
Originally Posted by cjkpkg View Post
Well if I redo the PSU, do I get another set of psu boards and another 300VA xformer or just replace the existing with a 600VA unit?

It would be easy to add another 22,000 uF per rail.

OK, I decided to go the 600VA xformer route and up the caps to 33,000 uF - 132,000 total uF.

Dont get me wrong - I am not disappointed in the sound of the F5 - I was just expecting more umph out of it. Serves me right for skimping on the PSU...

I wonder how the Aleph mini would sound with 4 more 22,000 uF caps and the 18V xformer?
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Old 31st March 2010, 09:14 PM   #7606
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Quote:
Originally Posted by cjkpkg View Post
I wonder how the Aleph mini would sound with 4 more 22,000 uF caps and the 18V xformer?

I found I couldnt get a decent transient sound with less than 40 volts DC.
All my amps run off +/-60 volts DC so the transients arent clipped.
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Old 31st March 2010, 09:31 PM   #7607
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by nigelwright7557 View Post
I found I couldnt get a decent transient sound with less than 40 volts DC.
All my amps run off +/-60 volts DC so the transients arent clipped.
maybe your speakers are "issue" - not amps ;

I can't find any lack in transients with Papamps in range of 30W/ch , at least when using speakers intended for that , even of 16ohms variety .

in any case - you found working solution , for your circumstances .
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Old 31st March 2010, 09:38 PM   #7608
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Quote:
Originally Posted by Zen Mod View Post
maybe your speakers are "issue" - not amps ;

I can't find any lack in transients with Papamps in range of 30W/ch , at least when using speakers intended for that , even of 16ohms variety .

in any case - you found working solution , for your circumstances .
The speakers werent the problem, they were good quality and high effiecncy speakers.
When I looked on the scope the transients were clipping even for moderately loud music at 40VDC.
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Old 31st March 2010, 09:46 PM   #7609
tinitus is offline tinitus  Europe
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Definately not "party amps"
But amps are not to blame for that
And you may get something else instead
Things you usually wont get with big power amp
Thats the whole point from the beginning with FirstWatt
Theres still not "one size fits all"
You need to know what you want, and learn how to achieve it
That matters more that anything
The best isnt the best, if it doesnt do what you want
But true, the best amp amps will be of little help if your speakers doesnt match
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Old 31st March 2010, 10:57 PM   #7610
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I play Barry White at my parties, where a couple watts are plenty.

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