POLL: Which is your fave Pass design ? F3, F4, F5, AJ

[vizion]

You're right, buzzforb. I'll update the results this evening.

 

[buzzforb]

You're right, buzzforb. I'll update the results this evening.

Sorry, but I was commenting on using lateral mosfets to" clean" the F5 sound. I thought clean was one of the major descriptions of the F5.

 

[tmblack]

According to post #26 by the master designer, the F5 is a little unforgiving.
Perhaps this is due to the hexfet having higher distortion levels than laterals and new SiC JFETs.

 

[h_a]

Perhaps this is due to the hexfet having higher distortion levels than laterals

Just for information, there is an app-note (TI?) showing that Toshiba verticals had even lower distortion than the Hitachi laterals; overal the differences were not so large.

Hannes

 

[jacco vermeulen]

National, LM4702, AN-1645.

 

[Nelson Pass]

According to post #26 by the master designer, the F5 is a little unforgiving.
Perhaps this is due to the hexfet having higher distortion levels than laterals and new SiC JFETs.

Actually, if you want a more "forgiving" F5, use the IR Hexfets instead of the
Fairchilds. The Fairchilds have lower distortion.

😎

 

[vidard]

Hi!

My vote goes to the AJ 😎

J is what makes me go round these days... 😛

Cheers!

 

[Audiofanatic]

F4

Hi,

For me F4.

Audiofanatic 😉

 

[vizion]

Update 4: Here are the results !

F3 - 4
h_a
Vix (ZV9)
Ryssen
Nelson Pass

F4 - 1
Audiofanatic

F5 - 4
anilva
Russellc
vdi_nenna
ramallo

AJ - 3
OllBoll
buzzforb
vidard

Leading Amp: It's a tie ! F3 and F5

 

[generg]

I am waiting for a delivery of LU1014 to finish F3......than I will give my points!

At the moment my favorite in the overall presentation is FFOUR!
I admire the relaxed way he is making music and and giving crazy details at/in unexpected moments.
F5 is impressive by throwing the music in the room with impressive force...... But for longer hearing I prefer FFOUR.😀

 

[vizion]

Update 5: Results !

F3 - 4
h_a
Vix (ZV9)
Ryssen
Nelson Pass

F4 - 2
Audiofanatic
generg

F5 - 4
anilva
Russellc
vdi_nenna
ramallo

AJ - 3
OllBoll
buzzforb
vidard

Leading Amp: Still a tie ! F3 and F5

 

[generg]

O.k., last days I tried F3 too, I cannot tell you exactly the reasons ........but I still like F4 more. This time I do not find the right words...😱

Another thing that I can recommend if you own a F4, drive him for a test with one pair of IRFs only......! And go up with the bias to the level of F5.
The sound gets younger....more fluidness, better highs 🙂🙂🙂
(less bass), but my open baffles stopp nevertheless at 70HZ and I have still no subwoofer.....

I was inspired to do this by Nelsons M2 also using only one pair of IRF and by Zen MOds crippled F4.
Less sweet than a J2 clone (J2 clone enhances the voices wonderful, but lacks a bit of precision) and more in the direction of F3 and Aleph3.

 

[vizion]

Thanks for the help, guys.

 

[Andy5112405]

I'm confused.

Where does the Aleph 4 fit into the range. Is the Aleph 4 the same as the F4 ?

Does someone have the schematics for the F4 and F5.

Where to go with the Aleph 4 if the F* is better, remember that the Aleph 4 uses +/-48V (even though mine is +/-43V) and 6 IRFP244s per leg, 24 in total.

 

[Zen Mod]

F4 and F5 are all around , and ditto at FIRST WATT HOME

 

[AudioSan]

no. F4 and aleph4 is not the same.

 

[3GGG]

Just finished my Aleph J and it kicks ****, so another vote for the Aleph J

 

[vizion]

Update 6: More results !

F3 - 4
h_a
Vix (ZV9)
Ryssen
Nelson Pass

F4 - 2
Audiofanatic
generg

F5 - 4
anilva
Russellc
vdi_nenna
ramallo

AJ - 4
OllBoll
buzzforb
vidard
3GGG

Leading Amp: A tie between F3, F5 and AJ

 

[tmblack]

Why F4 rated so low?
I guess its sound depends more on the preamp as it has unity gain at most. Or is it like the F5?

I hope it will work well with a tube preamp and Quad ESL-57 with 1 pair of output transistors only.

 

[tmblack]

How about the PLH where does it rank? Nelson says its real good.
How would one make it work on dual supplies?