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....!