F4 power amplifier

[jacco vermeulen]

Digikey overhere has the Silmics as well.

At 1/3d of the cost charged by the Euro fancy part shops.
Them boys gonna be p*ss*d, yes sirey.

 

[Tarasque]

I ordered the silmics here: http://www.banzaieffects.com

 

[Zen Mod]

Digikey overhere has the Silmics as well.

At 1/3d of the cost charged by the Euro fancy part shops.
Them boys gonna be p*ss*d, yes sirey.

where "overhere" ?

 

[Manu]

digikey.at for instance.

(http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=131081;keywords=elna)
manu

 

[chrismercurio]

Thank you......Santa and Peter

Always nice to know of a Black Gate alternative for nice sounding electrolytic that doesn't cost that much.

c

 

[culture]

I ordered the silmics here: http://www.banzaieffects.com

wow, that much cheaper than deaudiofabriek...

i think i'll try them on my second f4 to see the difference...

btw, this is what your sinks look like right now Tarasque

cheers,

c.

 

[culture]

and it's guts...

 

[Andrzej Sochon]

Please excuse this off subject discussion - not sure where to go! (and Yes, I have been told today!)

Sorry Andrzej for the confusion - it's nothing like that.

"Xfeed helps to sort out Cap differences"

Is there a place for H.P. discussion on DIY Audio?

Hello JH,

Would be great if Xfeed help to sort out C1/C2 Cap differences.

I tried to find something for you regarding H.P discussion, and nothing special. Maybe try this:
diyAudio Forums > Top >Amplifiers >Solid State >:: sq quadraphonic ::
http://www.diyaudio.com/forums/showthread.php?s=&threadid=5527&highlight=
or
diyAudio Forums > Top >Amplifiers >Pass Labs >ZEN-like headphones amp
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2451&highlight=
but there is nothing about X-feed here, I am sorry.

Best regards.
a.

 

[jameshillj]

Thanks Andrzej,
Yeah - diy Audio is not big on headphones which is a pity but, the headwize is fairly extensive plus are a few others, so a fair bit of information is around - just not here!

It's great to see NP is using the Silmics rather than the Pana FCs in the F4 amp. I assume your C1,2 (and C3,4) are beginning to settle down a bit by now and the power supply is now giving solid base response - hope the earthing problems are now behind you and can look forward to many years of very good music.
Perhaps I could interest you in a PCM63 dac project with a Linux computer source, yes?

 

[kraljmatjaz]

@Culture

Very good work. What heatsinks have you used? They look like Fischer.

Ciao,
Boris

 

[culture]

@Culture

Very good work. What heatsinks have you used? They look like Fischer.

Ciao,
Boris

Thanks Boris

I actualy don't have a clue, bought the sinks second hand from Tarasque so i guess you have to ask him They do their job very well!

cheers,

c

 

[fastvideo]

Looking to build a preamp that can drive a single channel to it's full output (solid state circuits).
anyone can help?

 

[tms0425]

The Pumpkin preamp will drive F4 nicely. I haven't built one, as it looks a bit too challenging for me, but boards and matched parts are available from Zen Mod. I use the Aikido tube pre - very easy to build, relatively inexpensive, dead quiet, and sounds terrific. Tom

 

[fastvideo]

built a 10X preamp using opa2604 with +/-24V supply.
it is able to drive f4 to full output.
the sound is very good.
with this setup, i think f4 is the best ref output amp to tell which opamp sounds better.

 

[Tarasque]

Thanks Boris

I actualy don't have a clue, bought the sinks second hand from Tarasque so i guess you have to ask him They do their job very well!

cheers,

c

I have these sinks from scrapped medical equipment. They work like a dream...That's all I know!

 

[luvdunhill]

so, is the 11/08/06 version of the schematic still the most recent:

http://www.firstwatt.com/downloads/f4_om.pdf

I remember something about a LED resistor change and a few more changes here and there...

 

[chrismercurio]

That is the most current schematic I know of...

The changes I know of are as follows:

P2 = 500 not 5k

and there are a few others....perhaps someone else can add them.

An addendum at the end of the owner manual or a new schematic would be awesome.

Peace,

C

 

[Nelson Pass]

No, you want the 6/4/07 schematic, and the LED resistor is any
value that pleases you.

 

[chrismercurio]

What I have comes from:

http://www.firstwatt.com/downloads/f4_om.pdf

Where is the 6/4/07 schematic?

Thank you,

C

 

[Dennis Hui]

What I have comes from:

http://www.firstwatt.com/downloads/f4_om.pdf

Where is the 6/4/07 schematic?

Thank you,

C

Looks like it's this one:

http://www.diyaudio.com/forums/attachment.php?s=&postid=1323676&stamp=1192210689

Dennis