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F3 pcb group buy...

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h_a

h_a

Member
Joined 2006
For those keen on F3 pcbs, a group buy is considered. If you're interested, you can express your wanted # of boards either in the

F3 pcb group buy Wiki

or in the original Zen#9 pcb group buy thread

Zen#9 group buy thread

In case someone has missed it, the F3 is a tuned version of the Zen#9.

Nelson himself says

The two are very similar, and from the DIY perspective
the differences are not worth bothering about.

The F3 has some refinements more applicable to those
with sophisticated test equipment.
Click to expand...

However I'm always a fan of improvements and better measurement results usually translate into better sounding.

Cheers, Hannes
 
h_a

h_a

Member
Joined 2006
Hi Nelson!

Hey that's a great gesture to say thank you for what you do for us!

It's just a shame that the problem is not getting a decent wine but sending it to you without breaking it nor paying a multiple of the wine's worth for shipping. In the moment I figure out how to do that I send you whatever the local wine specialists recommend me! Promised!

Or in the moment I no longer have this student budget but a real one ;-))

Cheers, Hannes

PS: by the way I'm NOT organizing the group buy, so please don't mail me for details; I just try to impress PD so that he starts the group buy ;-))
 
h_a

h_a

Member
Joined 2006
Yeah the time stamp is freaky.

Don't worry I set up the wiki-page in June 07 and the boards are not even ordered yet!

I added you for a stereo-set!

Anyway, Peter told me that he's going to order a larger number (larger than the # in the wiki).

All the best, Hannes
 
marsupialx

marsupialx

Member
Joined 2004
Ok, now I admit to being dumber than a box of rocks, or simply fatigued in the extreme, or both, but...I don't need the PS boards, and I can't figure out how to modify the Wiki. I went to the Wiki sandbox, and sat there for awhile. Just the amp boards please, thanks.-Jeffrey Hill (marsupialx)
 
h_a

h_a

Member
Joined 2006
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
 
h_a

h_a

Member
Joined 2006
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
 
R

RoboMan

Member
Joined 2006
h_a

h_a

Member
Joined 2006
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
 
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