F3 pcb group buy... - Page 2

RoboMan · 1st July 2007, 05:34 AM

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h_a · 1st July 2007, 08:25 AM

Don't worry Jeff, psu-boards are removed!

Cheers, Hannes

PS: by the way we just hit the 80 boards mark. Cool.

h_a · 2nd July 2007, 07:55 AM

Small update: presumably this week PD will adapt the Zen#9 layout to the F3.

The order itself has to wait until somebody confirms that the F4 boards are working (PD wants to order the F3 boards together with the F4 boards) - so come on people! Build the F4 and let Peter know!

Cheers, Hannes

tbrooke · 2nd July 2007, 03:05 PM

F4 v F3

Is there an F4 pc group buy? What are the differances from the f3? I'm on the F3 list and haven't paid much arttention to the F4.

Tom

h_a · 3rd July 2007, 08:24 AM

Since noone replied, I throw in that few I know about the F4.

The F3 is a power jfet amp which in my opinion has really everything it needs to become a classic or legend (read the Zen#8 and Zen#9 articles!!), stunning performance for a single stage amp and in my eyes outstandingly elegantly achieved.

The F4 is a powerbuffer offering only current gain (other amps do voltage gain) and I think no feedback at all. Especially recommended for high sensitivity speakers. PD does also a group buy.

But this is more or less all I know, better inform yourself at firstwatt.

Cheers, Hannes

RoboMan · 3rd July 2007, 06:33 PM

Quote:

Originally posted by tbrooke
F4 v F3

Is there an F4 pc group buy? What are the differances from the f3? I'm on the F3 list and haven't paid much arttention to the F4.

Tom

Peter Daniel has made some PCB for F4. But they are all sold out at the moment. He may order more later. See this link:

WTB: F4 PCB boards

Peter Daniel · 3rd July 2007, 08:44 PM

What about PS board? Will the one used for F4 be suitable here as well?
http://www.diyaudio.com/forums/showt...21#post1231121
http://www.diyaudio.com/forums/showt...60#post1237660

lordvader · 3rd July 2007, 10:36 PM

Can the F4 PSU be used as a single rail supply the F4 is dual rail, I think, while the F3 is sinlge rail ...) ?

Peter Daniel · 3rd July 2007, 11:11 PM

Although F4 PS board is symmetrical, it can be configured into dual single rail as well; it's just a matter of reverswing wires in one of the supplies.

h_a · 4th July 2007, 07:52 AM

It's amazing.

I just realized that Nelson has put the very same psu-schematic into the F3 and the F4 service manual.

Amazing, because he himself seems to use the very same psu-boards for both amps, since it's obviously copy & paste including both the 18V secondaries and the dual rail wiring - which the F3 both doesn't use.

Since the F3 gets fed with about twice of the F4 voltage rails, 50V, I guess the mere problem is the larger diameter of the higher voltage caps.

By the way, what is the schematic for your psu-boards, Peter? I see a TO-220 on the board which does not exist in the F4-psu schematic.

Cheers, Hannes

1st July 2007, 08:25 AM	#12
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Don't worry Jeff, psu-boards are removed! Cheers, Hannes PS: by the way we just hit the 80 boards mark. Cool. __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

2nd July 2007, 07:55 AM	#13
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Small update: presumably this week PD will adapt the Zen#9 layout to the F3. The order itself has to wait until somebody confirms that the F4 boards are working (PD wants to order the F3 boards together with the F4 boards) - so come on people! Build the F4 and let Peter know! Cheers, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

3rd July 2007, 08:24 AM	#15
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Since noone replied, I throw in that few I know about the F4. The F3 is a power jfet amp which in my opinion has really everything it needs to become a classic or legend (read the Zen#8 and Zen#9 articles!!), stunning performance for a single stage amp and in my eyes outstandingly elegantly achieved. The F4 is a powerbuffer offering only current gain (other amps do voltage gain) and I think no feedback at all. Especially recommended for high sensitivity speakers. PD does also a group buy. But this is more or less all I know, better inform yourself at firstwatt. Cheers, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

3rd July 2007, 08:44 PM	#17
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	What about PS board? Will the one used for F4 be suitable here as well? http://www.diyaudio.com/forums/showt...21#post1231121 http://www.diyaudio.com/forums/showt...60#post1237660 __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

3rd July 2007, 11:11 PM	#19
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Although F4 PS board is symmetrical, it can be configured into dual single rail as well; it's just a matter of reverswing wires in one of the supplies. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC


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1st July 2007, 05:34 AM	#11
RoboMan diyAudio Member Join Date: Jul 2006	Click the line near the bottom that says "Click here now to edit ...." and you may be asked to enter your User name and password. Then you can make changes.

2nd July 2007, 03:05 PM	#14
tbrooke diyAudio Member Join Date: Apr 2007 Location: China Grove, NC	F4 v F3 Is there an F4 pc group buy? What are the differances from the f3? I'm on the F3 list and haven't paid much arttention to the F4. Tom

3rd July 2007, 10:36 PM	#18
lordvader diyAudio Member Join Date: Mar 2002 Location: n/a	Can the F4 PSU be used as a single rail supply the F4 is dual rail, I think, while the F3 is sinlge rail ...) ?

4th July 2007, 07:52 AM	#20
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	It's amazing. I just realized that Nelson has put the very same psu-schematic into the F3 and the F4 service manual. Amazing, because he himself seems to use the very same psu-boards for both amps, since it's obviously copy & paste including both the 18V secondaries and the dual rail wiring - which the F3 both doesn't use. Since the F3 gets fed with about twice of the F4 voltage rails, 50V, I guess the mere problem is the larger diameter of the higher voltage caps. By the way, what is the schematic for your psu-boards, Peter? I see a TO-220 on the board which does not exist in the F4-psu schematic. Cheers, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

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