What To Do With Those 2SJ28's

[plasnu]

TKS45F323 SIT 😀 is much easier to discover a meteorite in the house garden.
Esoteric & rare & exotic & cost new was ~ 570$ one pcs.

 

[R-K Rønningstad]

Soundhappy, what was the original use of the TKS45F323? Is it an audio device, or maybe radar?

 

[Soundhappy]

I think is radar device but useful for amplification :

SITamp

 

[Soundhappy]

So, how many do you have Soundhappy? 😀

Fews "UFO" 1KWatt's waits after my 2SJ28 DIY work is done next exciting future project's.

 

[Zen Mod]

nice to see them (again) and I'm really glad that anyone is having them

 

[Soundhappy]

Vfet | Mosfet 35 Watts push-pull amp DIY schematic designed by Uda Hitoshi

Find this article inside of old DIY magazine and share with Vfetcionados 😀

 

[Zen Mod]

SHappy , did you made anything with those Saucers , from post #364?

 

[Soundhappy]

It was busy time last months , but try just simple test and conclusion all work good

 

[Soundhappy]

My audio upgrade horn's voice is charming What To Do With Those 2SJ28's
Now interested by 2SJ28 or 2SK82 new Single - Ended amp by venerable Mr.
Oh what the other TO-3's inside ?

 

[Zen Mod]

I forgot earlier , so asking now - can you give more info about these horns & drivers?

they look gorgeous 🙂

it bells Cinemeccanica in my brain , but I never saw these anywhere

 

[woody]

Tubecad had this simplified circuit using a tube and a P channel
mosfet. I don't see any reason a 2SJ28 wouldn't make a good substitute
for that P channel mosfet. Sure you could subsitute a 2sk170 for
that 12b4 but where is the fun in that.

 

[Soundhappy]

No. It's going to be a surprise.

The design for the new DIYaudio VFET kits uses one VFET per channel.

The N channel and P channel VFETs have separate artwork, and slightly
different performance.

Each channel goes onto a bar similar to last time which holds 4 TO-3
devices and mounts on the DIYaudio store heat sink hole pattern.

The output stage is a follower, and has a socket for different front ends.

Availability should be March or so.....

Yes Papa please more DIY SE amplifiers Kind regards

 

[Nelson Pass]

I finally have all the parts. Transistor bar holds 4 T0-3's for one channel, and the
bar fits the the hole patterns on heat sinks in the diyAudio store.

Looking at my calendar, I think I can commit to a release in January. The quantities
will be very limited due to the lack of VFETs, but those of you who have some
already can get the rest of the kit.

 

[BeardyWan]

Is it possible to enable use of the large, more available Vfets?
many thanks

 

[Nelson Pass]

Possible, yes. Do you mean the 2SK182 / THF-51s?

 

[nicoch58]

Looking at my calendar, I think I can commit to a release in January.

Great !!

 

[Soundhappy]

..more available Vfets?

Possible 2SJ20 NEC ( old named Tokin )
this one is perfect candidate for TO-3 format drilled T bar.
Verified genuine source 2SJ20 NEC V-FET Sit utilise une seule piece extremly rare!!! | eBay
Enjoy life is good 🙂

 

[Soundhappy]

Possible, yes. Do you mean the 2SK182 / THF-51s?

Does Mr. Pass play with NEC 2SJ20 triode ?
Could be interesting alternative semiconductor for this Sony SE DIY build ?
Thanks for exciting kit news 😀

 

[hifibluedevil]

I have a few of those NEC vfets (Ns and Ps) all tested good. There is a chart somewhere in diy audio forums which shows their operating characteristics are very close to Sony versions. I would assume they can be used directly in Papa's upcoming kits.

 

[WBS]

Has anyone found an N ch device that plays nicely with the 2SJ28 for use in a DEF amp design?

Other than matching gate voltage in order to self-bias, what would the needed parameters be? Is finding a suitable candidate simply a case of combing thousands of data sheets to find one?

😕