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Old 29th November 2008, 05:14 PM   #2091
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I would wish it would work. However, another note of concern I read in the link provided says:

"... specified for many headphone amplifiers, preamplifiers, and power amplifiers up to around 20Wrms power output into 8Ω."

The F5 working in class A will draw continuous current far in excess of 1 A or 20 W rms. I remain skeptical it will work (very long). I did not find the "overkill heatsink" you refer to.

Regulation may be of limited value since the current draw is continuous. Papa Pass doesn't do his that way.

Another sign of concern: The parts list includes a transformer rated for 80 VA. The recommended transformer for the A5 is in the range of 400 VA.
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Old 29th November 2008, 06:55 PM   #2092
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Quote:
Originally posted by Ed LaFontaine
Papa Pass doesn't do his that way.
I thought that reducing voltage fluctuation across the output devices was part of Papa's Stasis trick.

Question is : What's the use of regulated rails if the amp itself switches to AB operation beyond 2 1/2 amps output current.
Maybe if you put Eight F5's per channel in a 4x2 parallel bridged setup.
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Old 29th November 2008, 07:15 PM   #2093
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ok...i will take this as good news...i will save quite a bit on enclosure and components by going to a standard ps.

thank you
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Old 30th November 2008, 08:49 AM   #2094
Luke is offline Luke  New Zealand
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Quote:
Question is : What's the use of regulated rails if the amp itself switches to AB operation beyond 2 1/2 amps output current.
I thought regulation is not so important in class A as current draw is constant?
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Old 30th November 2008, 10:19 AM   #2095
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History channel ;

1977 : Mark Levinson, ML2
1990 : Gerard Perrot, l'Ampli Fou
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Old 30th November 2008, 06:31 PM   #2096
Skorpio is offline Skorpio  Denmark
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Default PCB?

Does anybody have board for F5 for sale?

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Old 30th November 2008, 07:09 PM   #2097
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Default F5 PCB

Hello this is my PCB, it is designed to be mounted on a flanged heatsink as Nelson does in his designs.
Can anyone give it a look in order to find mistakes on the layout? I have got only 2 eyes....

Thanks!
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Old 30th November 2008, 07:36 PM   #2098
estman is offline estman  Estonia
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Default Re: F5 PCB

Q3 - check G and S pins.
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Old 30th November 2008, 09:00 PM   #2099
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Default F5 PCB

Thank you, Estman!
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Old 1st December 2008, 07:23 AM   #2100
cviller is offline cviller  Denmark
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Wow!

I just made the F5 this weekend and I must say I'm very impressed. After having done a detour of Aleph J and a gainclone (kinda of a must for diy people to try out), I had a Saturday alone (no distractions), so I drew, etched and populated my new F5. Yesterday I fired it up, adjusted and listened. Great amp! Thanks NP.



One thing I noticed right away was the clarity in high frequencies and the detail of instruments.

My pcb is single sided and I didn't care too much about wire placement, but assembly was easy anyways. If anyone wants a bw version just drop me an email. The board is 105x50mm and the distance between power fets holes is 80mm.
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