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Old 21st October 2008, 01:55 AM   #11
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Got boards for those 'fets that match the box?
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Old 21st October 2008, 02:04 AM   #12
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I ended up with #25. 4 complementary pairs per side, 2X40 and
about 330VA if the Avel number is valid. I'd be very happy to head
in the F4 direction, though it looks like the voltage needs to be lower
to be in line with the F4 schematics. Happy to obtain an appropriate
transformer. Your offer to shepherd is a huge bonus on top of the
material generosity.

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Old 21st October 2008, 02:17 AM   #13
Variac is offline Variac  United States
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OK Nelson....

Guys, the main reason Nelson is going on about this is that he gave me the extraordinary gift of two of the big chassis that were each of monoblock configuration! When my wife gets back from her latest business trip won't she be pleased!

My brother Jon won an auction for a chassis too, so I WILL need help.
One can't have to many F4's, though I think that my current F4's are pretty cool

but I now need to make a high output preamp- maybe with 4 channels now!

Mark

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Old 21st October 2008, 02:18 AM   #14
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Skip_Pack: I got one the "shorter" (but not much lighter) units = #26 = Two 100 VDC (working) 15K caps and the 25/0/25 xformer with the 'fets and boards ( http://www.diyaudio.com/forums/showt...42#post1637142 ) ... trade? ... variac ?
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Old 21st October 2008, 04:00 AM   #15
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From my uninformed point of view, my board set looks like it's
amenable to an F4 with four pairs per side rather than three, and
that's attractive to me. I'd gladly swap transformers, my +/- 40
for your +/- 25, though I recognize you may not get to where you
want to be with that trade.

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Old 21st October 2008, 05:40 AM   #16
preiter is offline preiter  United States
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My "unknown" transformer is of a type I'm not familiar with. It has the usual dual primaries, but the secondary wires consists of 2 reds, 2 blues and a white wire.

voltage across the reds is about 80V, across the blues is 96, and from the white to either red is 40V and the white to either blue is 48V. That's with the primaries in parallel.

Even if I run the primaries in serial it's not a real good fit, but I do have a 330VA 25+25 toroid from an old project that I never finished.
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Old 21st October 2008, 08:08 AM   #17
defect9 is offline defect9  Ireland
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I'm sad I couldn't make it this year. Then again, I'm sad every year I cant make it (which has been all of them so far since finding this forum lol). Should start saving for the trip now, i guess.

and yes, greedy me wishes for one of those "mostly built" amps too. I can't deny that in the least

-Jared

*edit* I'll pay shipping and a reasonable handling/packing charge if anyone doesnt want theirs
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Old 21st October 2008, 03:11 PM   #18
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Preiter -- We're reasonably closeby. I'm in Hollister. We might
benefit by stumbling through this cooperatively without wasting
forum bandwidth on things trivial to the larger group. Send me a PM
if this makes sense to you.

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Old 21st October 2008, 05:09 PM   #19
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Six_Pack / Preiter -- " We're reasonably closeby. ... We might benefit by stumbling through this cooperatively ..."

If you guys swap out, let me know if there are any leftovers ... I can come down some weekend or trade via UPS at my expense ... My transformer is 25+25 (dual 120/240 primaries, 330 VA?) and I do want to "upgrade" to 50+50 for a rail voltage above +/- 75 or +/- 80 VDC. ... Preferring wattage around 500 to 600 Watts, although for my purposes, this is generous.

I know this may be a stretch, but if no joy, I'll just buy the proper one somewhere. (I don't think this is a waste of bandwidth at all, but if email is preferred, so be it.)
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Old 21st October 2008, 05:20 PM   #20
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I'm happy to conduct this on the forum -- I'll let Variac provide guidance
if we're too mired in minutia. Here's a clip from an email I just sent
to Prieter:

I got the various data sheets and the F4 manual with schematic. My
chassis has complementary IRF230's while the F4 uses IRF240's (N
and P channel pairs). While I'm not knowledgable enough to say for
sure, it looks like the 230's are more or less the same with a current
rating slightly below half that of the 240's. It's possible the front end
of the F4 could plug right in.

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