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Old 12th January 2012, 08:08 PM   #11611
Zen Mod is offline Zen Mod  Serbia
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Papa

should I post real F5 TURBO plan , for Greedy Boyz ?

no foolin' this time .......
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Old 12th January 2012, 09:11 PM   #11612
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally Posted by 6L6 View Post
Rixsta - to verify, it has a single primary?
Indeed!

"Solution is easy - move to USA or other country with 115v mains, and the transformer will be perfect voltage. A bit small VA though"

haha love it! well i like the idea

"either that , or to use looooong extension cord"

like a few miles ? hahaha too funny!
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Old 12th January 2012, 09:16 PM   #11613
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally Posted by Nelson Pass View Post
I'm done taking photos and such and then I'm off to the coast to write
the text. This and the F6 will be done before the end of the month.

There are several versions of the F5 TURBO.

Lots of room to play.

Thankyou so much for the wonderfull sounding amplifiers! the enjoyment for me bulding them, i liked electronics as a child but have realy been first and foremost a musician but had to build the amps and they proved to provide me with the natural sound i needed to mix my own songs

EUVL, thankyou ! im off to the pub to play some music with the band but after shall check this out, thanks muchly!
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Old 12th January 2012, 09:23 PM   #11614
Rixsta is offline Rixsta  United Kingdom
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if only i had enoth money for those "Pass Labs Rushmore", speakers id be laughing right now!
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Old 12th January 2012, 11:48 PM   #11615
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Quote:
Originally Posted by labjr View Post
Looks like FQA19N20C has to be a higher current part then the FQA12P20 in the F5. Seems kind of scary to use a TO220 part considering how hot these parts run in the amp.

I do have some of both which I've had for while. Just not sure how many are needed to find matching pairs.
From spec sheet the FQP TO 220 has much more current capability than the
FQA counterpart
I think is down to the construction methods that are different for P and N channels.

Current for FQP is 19 A for the FQA 12 A.

Agree with you it is scary to use a TO 220 but whit due care and hard work I have been running them for the past 4 months.

Papa said that for the litle ones 40 W is the limit for the larger ones 50 W

I have used Kerafoll 86/83 (as far as I know it is the best interface material for performance) Bar clamps to increase the pressure on the Mosfets
Large cooper heath spreaders and same rather big heat sink.

I believe that the most important thing to wach out for is the Junction themperature, the drain pin is directley conected to this and mesuring close to the mosfet body can give a prety accurate temperature mesurament of the Junction itself .

I am running 2 paralell mosfet at 2.6 A 26 V

1.3 X 26 = 34 W so no where near the 40 W limit.

to look at this another way
supose you have 2 similar amplifiers (same current voltages and sinks)

One use perfectley adequate mica and goop and one 3mm screw to clamp the lot togheter, the sink, supose, will be warm

The second amplifier uses better thermal coupling for the mosfets say for argument sake 1/2 of the previous one

still a warm sink but what will be the Junction temperature?

I have (only way to get them for me ) 100 off each. (less the one I am using)

So for matching pairs I recon 100 is enough ?

I did match the mosfets at 2A 24 V and keeping the temperature of the DUT at 50 C (VGS is temperature dependent)

I made that offer not for making a profit and it stand as that.

I was going to post spec shets but PDF files to large.

There may be other merits of the smaller TO220 case such as lower capacitance and such that may make this a better choice.

I can hardly spell corectley so I will refrain from reading Data sheets
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Old 12th January 2012, 11:50 PM   #11616
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Quote:
Originally Posted by Zen Mod View Post
Papa

should I post real F5 TURBO plan , for Greedy Boyz ?

no foolin' this time .......
Yeah and you think I am going to fall for that again...

Yes please (be funny any way) and then I may be wrong and you relly got the real thing this time.
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Old 12th January 2012, 11:55 PM   #11617
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Quote:
Originally Posted by Nelson Pass View Post
I'm done taking photos and such and then I'm off to the coast to write
the text. This and the F6 will be done before the end of the month.

There are several versions of the F5 TURBO.

Lots of room to play.

Tanks Nelson

"severall version"

Yess please.
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Old 13th January 2012, 01:48 AM   #11618
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Quote:
Originally Posted by Zen Mod View Post
Papa

should I post real F5 TURBO plan , for Greedy Boyz ?

no foolin' this time .......
Please do
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Old 13th January 2012, 02:05 AM   #11619
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by didiet78 View Post
Please do
coincidently , Papa just gave his blessing for publishing this :

Attached Files
File Type: pdf F5 turbo_schematic.pdf (66.0 KB, 479 views)
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Old 13th January 2012, 02:12 AM   #11620
mikojat is offline mikojat  Indonesia
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I'm first, thank's Zen...
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