DIY progress report

[carpenter]

By the specs seems to me that the F5 will be a long lived amp not the 100 unit limited production variety; but a CLASICAL by all means.

Just my 2c

With specs like that, how could it not be a classic! I have to chuckle--I love the F4 and thought that nothing could match its performance, diy anyway, and here come the F5 with specs from heaven........ My g-d, what will Nelson think of next.

 

[apassgear]

My g-d, what will Nelson think of next.

A nice hi spec Lineamp to go with the F5. Another Classic maybe?

 

[carpenter]

A nice and hi spec Lineamp to go with the F5. Another Classic maybe?

Greedy boyz.......

 

[Babowana]

The F5 . . . Here's a teaser - distortion into 8 ohms.

Woo poor sugar nowhere to stay . . .
The sound doesn't miss some of sugar for the sweet taste?

 

[Zen Mod]

A nice hi spec Lineamp to go with the F5. Another Classic maybe?

Greedy boyz.......

NS10 , anno 2008 .......anyone ?

 

[jacco vermeulen]

Like an F4 with gain?

"not just another SE" does not translate to PP.
Look at the monotonic distortion rise of the F5 graph, bottom part is artifacts.
Cheesy Igor says that fits well with the "low" 20 Last Watts number the Master revealed.

 

[Zen Mod]

"not just another SE" does not translate to PP.
Look at the monotonic distortion rise of the F5 graph, bottom part is artifacts.
Cheesy Igor says that fits well with the "low" 20 Last Watts number the Master revealed.

mini XA30 spiced ......

just to make little more mess ........

 

[mpmarino]

Naaa,

I think it's a bridged F2 with X on top.

 

[apassgear]

NS10 , anno 2008 .......anyone ?

With JFET?

That idea also crossed my mind

 

[Zen Mod]

Naaa,

I think it's a bridged F2 with X on top.

bridged F3 with bal/unbal input




( that , or Krell KSA 5 , bridged )

 

[Vix]

I will have something else to tide you over until then, lest you
become bored.

A buffer? Seems that lots of people needed, and may still need a nice and simple line stage buffer. Now, if that would carry a Firstwatt logo, it would be even more interesting...

What happened with a preamp? Decided about its name?

Regards,

Vix

 

[Nelson Pass]

Yeah, I got your buffer right here....

 

[carpenter]

Yeah, I got your buffer right here....

I'll get the wax!

 

[Manu]

In the 2/2008 issue of german LP Magazin there is a nice review from our friend Holger about the Pass INT-150.

He mentioned the use of some mysterious maxim chip as volume control...



Manu

 

[noisefree]

Hi manu,

when you are counting the legs of the IC and when you are looking for the chip size, then there is only one possibility left over for the exact type.........!!!


Does anyone know if there are McMiller(?) resistors (feedback from outputs to the J-Fet sources) applied to the new UGS5-module?
I cannot see a connection from one of the sourcepairs to a module-connectorpin!
No need for it???

Greetings
Dirk

 

[noisefree]

.......have forgotten something.....

Also a great review of the INT-150 in the hifi&records magazine 1/2008!

And excellent tests of the XA30.5 and the F3 with very nice pictures in the image hifi magazin 1/2008!

Nice sunday!

Dirk

 

[Manu]

Hi manu,

when you are counting the legs of the IC and when you are looking for the chip size, then there is only one possibility left over for the exact type.........!!!

Hi Dirk,

... or when you visit famous pumpkin-thread at analog-forum.de

Actually I wanted to adress much more the interesting fact that Nelson choose this kind of volume control...

.......have forgotten something.....

Also a great review of the INT-150 in the hifi&records magazine 1/2008!

And excellent tests of the XA30.5 and the F3 with very nice pictures in the image hifi magazin 1/2008!

Nice sunday!

Dirk

Thanks for Hinweise!
I like to collect Pass Labs reviews
Nice sunday too

Manu

 

[Nelson Pass]

Does anyone know if there are McMiller(?) resistors (feedback from outputs to the J-Fet sources) applied to the new UGS5-module?

No.

 

[noisefree]

Hello Mr. Pass

Thanks a lot!

Sorry but I cannot stop asking you again...

When there are no such feedback paths you need other tools to stabilize the output offset.
Have you handled that (with a trick) in the voltage bias circuits?
Your PP-designs (X and X.5) need the "McMillan resistors" and they have a normal adjustable V-reference for the bias.
Are the two elcaps in the voltage bias circuit (XA.5) for coupling front end with PP-pairs?
(perhaps a DC separation makes the output offset handling easier!?)

Greetings
Dirk

 

[GRollins]

I'm in the (what I hope are) final stages of putting together a no-feedback amp that's quite stable DC-wise. No resistors. No servo. No muss. No fuss.
Ain't life grand?

Grey