F5 Turbo is posted - Page 9

Bigun · 02:18 AM

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.

ra7 · 9th February 2012, 04:52 AM

Quote:

Originally Posted by Bksabath

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?

geraldfryjr · 9th February 2012, 05:38 AM

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

sangram · 9th February 2012, 07:11 AM

Quote:

Originally Posted by ClothEar

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.

Zen Mod · 9th February 2012, 07:44 AM

Quote:

Originally Posted by sangram

......

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)

bifi · 9th February 2012, 09:43 AM

Digikey and Mouser marked the Fairchilds as Discontinued / Obsolete

sangram · 9th February 2012, 09:48 AM

^^Of course

Thanks so much!

jacco vermeulen · 9th February 2012, 10:05 AM

Quote:

Originally Posted by ClothEar

eBay seller has well-matched pairs.

1-2 % is "well" matched ?

EUVL · 9th February 2012, 10:17 AM

Better than not matched at all, Jacco.

Patrick

jacco vermeulen · 9th February 2012, 10:18 AM

True, merely found the mentioned 2%, 1%, and 0.02mA amusing.

9th February 2012, 02:14 AM	#81
Bigun diyAudio Member Join Date: Jan 2009 Blog Entries: 2	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. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig. Last edited by Bigun; 9th February 2012 at 02:18 AM.

9th February 2012, 09:43 AM	#86
bifi diyAudio Member Join Date: Dec 2005 Location: Germany	Fairchilds Digikey and Mouser marked the Fairchilds as Discontinued / Obsolete

9th February 2012, 10:17 AM	#89
EUVL diyAudio Member Join Date: Oct 2003	Better than not matched at all, Jacco. Patrick __________________ xen-audio.com

9th February 2012, 10:18 AM	#90
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	True, merely found the mentioned 2%, 1%, and 0.02mA amusing. __________________ Not so much,.......if it says "ZM" in the corner.

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9th February 2012, 05:38 AM	#83
geraldfryjr diyAudio Member Join Date: Feb 2008 Location: Jackson,michigan	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

9th February 2012, 09:48 AM	#87
sangram diyAudio Member Join Date: Sep 2002 Location: India	^^Of course Thanks so much!

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