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Old 9th February 2012, 02:14 AM   #81
Bigun is offline Bigun  Canada
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wow, 100W Class A - that's huge !



nice to see the P3 harmonic adjustment - I used the same kind of thing (TGM goes tubey thread) before and can testify that it works but I expect it's much better with Class A than trying this in Class AB.
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Last edited by Bigun; 9th February 2012 at 02:18 AM.
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Old 9th February 2012, 04:52 AM   #82
ra7 is offline ra7  United States
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Quote:
Originally Posted by Bksabath View Post
I have FQP19N20 the TO220 version of the FQA
Current is nearer to the counterparts

They have been running since August and no problem so far.

They are still avvaliable evveriwhere.
How did you mount them to the heatsink? That TO-220 case looks weird. How many watts are they dissipating?
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Old 9th February 2012, 05:38 AM   #83
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This is too Cool !!!

After seeing some specs, I so want too build a set of these!!

It looks as if that they fill my requirements of at least 40Vpeak and into 1 ohm peaks as well for driving my DIY ESL's.
With a very simple circuit ,few parts and great specs to boot!

I already have a few large transformers in the 1000VA range that will work.
Just need to get the semi's and some very large capacitors and some sort of heatsink system,I have a liquid cooled type in mind maybe.

It will be awhile before I build a monster version but I will now start with the basic F5 though, as I was thinking about the AlephJ-X as well.

Thanks, Nelson Pass !!!

Jer
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Old 9th February 2012, 07:11 AM   #84
sangram is offline sangram  India
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Quote:
Originally Posted by ClothEar View Post
For the JFETS, eBay seller "alweit" has well-matched pairs. Highly reccommended seller!

eBay - See alweit's JFETS here
Thanks.

Any idea if I can get the Fairchild output devices any more? I do have one set (unmatched) of the input pair but no output devices.

I assume with all the banter that any high-speed diode with a decent current reserve will do for the output stage.
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Old 9th February 2012, 07:44 AM   #85
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by sangram View Post
......

I assume with all the banter that any high-speed diode with a decent current reserve will do for the output stage.
decent current , appropriate U/I characteristic (read -voltage sag at said current)
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Old 9th February 2012, 09:43 AM   #86
bifi is offline bifi  Germany
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Default Fairchilds

Digikey and Mouser marked the Fairchilds as Discontinued / Obsolete
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Old 9th February 2012, 09:48 AM   #87
sangram is offline sangram  India
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^^Of course

Thanks so much!
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Old 9th February 2012, 10:05 AM   #88
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Quote:
Originally Posted by ClothEar View Post
eBay seller has well-matched pairs.
1-2 % is "well" matched ?
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Old 9th February 2012, 10:17 AM   #89
EUVL is offline EUVL  Europe
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Better than not matched at all, Jacco.




Patrick
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Old 9th February 2012, 10:18 AM   #90
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True, merely found the mentioned 2%, 1%, and 0.02mA amusing.
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