F4 power amplifier

[chrismercurio]

Thanks Dennis and Nelson. Now another dumb question (for Peter Daniel or anyone else):

Are the Peter Daniel boards compliant with both?

Thanks in advance,

C

 

[luvdunhill]

Thanks Dennis and Nelson. Now another dumb question (for Peter Daniel or anyone else):

Are the Peter Daniel boards compliant with both?

Thanks in advance,

C

ya beat me to it. I'll look tonite, but I'm guessing no due to D3/D4.

 

[Peter Daniel]

Are the Peter Daniel boards compliant with both?

The boards are made according to 6/4/07 schematic, with the exception of R1 resistor, which on my boards is before shunt resistor R2 (and not after, like in the schematic).

 

[chrismercurio]

Thanks Peter, and to everyone else whom IMO, makes this the best BBS for audio DIY'ers.

C

 

[anubisgrau]

F5 due?

I've heard rumours that F5 is to be released very soon as the next step from F3.

Anyone knows more?

 

[xaudiox]

Re: F5 due?

I've heard rumours that F5 is to be released very soon as the next step from F3.

Anyone knows more?

http://www.diyaudio.com/forums/showthread.php?s=&threadid=4486&perpage=25&pagenumber=70

 

[Nelson Pass]

The F5 is different. I wouldn't say it's an extension of the previous
efforts in any direct sense. I think it will be a little while before FW
starts repeating itself.

 

[chrismercurio]

6moons

announced a review....

 

[Srajan Ebaen]

Indeed

Nelson promised a unit but the news embargo on this end is in effect too - no idea yet what this beast will be, exactly. Except that the bloody 200KHz square wave looks pretty scary and that 1-ohm 10A clipping graph is pretty suggestive all by itself...

So once one of you boys gets his AudioXpress, share the spoils so the press isn't the last to know

 

[chrismercurio]

The cat will be out of the bag soon enough...

 

[Variac]

Just that Nelson chose to publish this particular design means it's gonna be something different and special.

 

[Nelson Pass]

Re: Indeed

Nelson promised a unit but the news embargo on this end is in effect too.

Srajan's amplifier should ship next week after they remove my tube.

 

[Srajan Ebaen]

no rush

My wife and I celebrated her 1st rebirth day a few days ago - one year after her open-heart surgery in Germany which coulda been the end of it but thankfully, the expiration date got postponed.

Compared to health, none of this stuff matters one bit. Wishing you a speedy recovery, Nelson.

 

[jacco vermeulen]

remove my tube.

As in general overhaul ?

 

[Variac]

So, Nelson isn't 100% solid state..
But it appears that he soon will be...

 

[Nelson Pass]

When they remove the Drain, I'll only have a Source and Gate.

 

[Blues]

But you'll always be N-channel and P-channel...

 

[lykkedk]

Kindoff offtopic, but Nelson, say's the Elna silk 220uF cap's are a good choise for the F4, but i can't figure out, what voltage it must be (the one i use now is 35v or 63v i can't remember excatly) I think my pcb used ~5mm between legs.

Could someone help me out

Jesper.

 

[culture]

Kindoff offtopic, but Nelson, say's the Elna silk 220uF cap's are a good choise for the F4, but i can't figure out, what voltage it must be (the one i use now is 35v or 63v i can't remember excatly) I think my pcb used ~5mm between legs.

Could someone help me out

Jesper.

don't take my word for it, but i think c1/c2 should be 20v or more since this is the maximum SE output voltage.. i'll be trying 25v silmics soon, almost ready to test them. For c3/c4 i'll be using 63v panasonic fc's and the optional caps (on peter's boards) will be 1800 uf 35v panasinic fc's... they do't fit well, i might go for 220 uf instead of 1800 uf

 

[Zen Mod]

Kindoff offtopic, but Nelson, say's the Elna silk 220uF cap's are a good choise for the F4, but i can't figure out, what voltage it must be (the one i use now is 35v or 63v i can't remember excatly) I think my pcb used ~5mm between legs.

Could someone help me out

Jesper.

just observe what's your p-p amplitude , and you'll know