Sony VFET Amplifier Part 2

[luvdunhill]

I have a question about the cascode bjt theory of operation. So they both have a fixed Vbe of +/- 13.7v and their Vce varies from 13-28V?

 

[2 picoDumbs]

This is pure art.

 

[R-K Rønningstad]

This is pure art.

How does the ribbon cables sound?

 

[luvdunhill]

How does the ribbon cables sound?

Thin.

 

[Zen Mod]

they sound exactly

 

[2 picoDumbs]

they sound exactly

I agree

 

[Algar_emi]

Hi All. These are my results, and maybe someone can exchange some VFET with me to complete each other kit. I have 4 of each K82/J28.

My results are (at 0.5A)
2SK82:
7.98/7.95 (good pair)
7.86
9.60

2SJ28
7.14/7.16 (good pair)
6.54
10.25

Thanks
SB

 

[nagini262]

After someday so busy, I and some friends have a direct comparison Sony VFET P2 and Firstwatt F6 (R100 version) with:
+ Source: computer
+ Loudspeaker: Fostex FE103-Sol (50th anniversary - 16 ohm version) with FE-103En cabinet
The result: can you guess? Ola........... VFET P2 is better for all bandwidth. The difference is huge and it is very difficult to return to hear F6. I really love VFET transistors!

 

[Zen Mod]

who's that hand-waving guy ?

 

[2 picoDumbs]

who's that hand-waving guy ?

My new adopted father.
Hehehehe

 

[generg]

That is too nice....!

 

[fatbattery]

Not sure if this is the right place for this.

SITamp

I thought it maybe of interest for someone.

 

[kenthf]

Hi there,

interested to get 4 pairs to build a set, any advise where to get them?

good day

 

[Eric]

Ola........... VFET P2 is better for all bandwidth. The difference is huge and it is very difficult to return to hear F6. I really love VFET transistors!

I have most of what I need to start working on a VFet P1 and I've been wondering if I might like the P2 version better.

I know some kits might be available in the near future, but was wondering if there might be some value in pooling and matching VFets that people have gathered. I have 8 pcs of 2SJ28 (marked KF-33) and 4 pcs of 2SK82 (marked KE-33) that I obtained from CircuitDIY, but I haven't matched them yet. I suspect as a group, we have a pretty large collection of these...

 

[dantwomey]

I've been away for awhile.....any light at the end of the tunnel for the VFET2 PCBs yet?

Regards,
Dan

 

[atmasphere]

Not sure if this is the right place for this.

SITamp

I thought it maybe of interest for someone.

It is. Where can you buy those devices?

 

[Soundhappy]

It is. Where can you buy those devices?

They are very rare Tokin sit's only small run was made

 

[dady]

It is. Where can you buy those devices?

Hey Master! You finally found the real thing.
Welcome Ralf!
Best Regards

 

[Soundhappy]

It is. Where can you buy those devices?

They was used only in diy projects not commercial product was made contrary to few Sony's.
I know some TKS45F from MJ articles and other THF-15 sit as well.
Who belive strongly can find every thing for example asteroid stone in his garden or Tokin semiconductor triodes
Let's back to the topic with 2SJ28 and DiyAudio Store kit are much more realistic.

Ps. Ola ! to my friend Dady

 

[dady]

Hola Macho! Christophe from Montpelier....!