What To Do With Those 2SJ28's

[Soundhappy]

Greedy Boyz what is it on Papa news photo ? Puzzle question haha

 

[Soundhappy]

Try N° 1 : front end stage are not there..
oh maybe audio transformer in the photo corner

 

[hifibluedevil]

Looks like F3 with power jfet replaced by Sony 2Sj28 vfet, other three are Toshibas or some rare mosfets.

 

[Dennis Hui]

Anything in TO-3 form is pretty rare these days so it'll be fun to
eventually see what they are.

 

[Soundhappy]

Maybe we see voltage regulator in TO-3 package ?
Bias made with optocoupler

 

[Zen Mod]

2 optocouplers

 

[Soundhappy]

Looks like F3 with power jfet replaced by Sony 2Sj28 vfet...

Maybe from left to right : voltage regulator + vfet + cascode + CCS all in TO -3 package

 

[Soundhappy]

 

[nicoch58]

Greedy Boyz what is it on Papa news photo ?

look like my new amp

 

[Soundhappy]

2 optocouplers

Holy soldering smoke!

 

[Zen Mod]

expect new trick or two to learn there ......

 

[Soundhappy]

 

[Nelson Pass]

Yes, new trick. I have a snappy name for it too....

 

[TungstenAudio]

First Watt V8?

 

[nicoch58]

Super wiz!!

 

[Soundhappy]

Green color 3 watt's Vishay Draloric resistors https://www.mouser.fr/datasheet/2/427/acac-at-1762688.pdf

 

[Lukyk]

I think, that diyaudiostore page visits per day, must have increased hundred percent, as all of us greedy boys are waiting for a chance to get one

 

[aspringv]

I think, that diyaudiostore page visits per day, must have increased hundred percent, as all of us greedy boys are waiting for a chance to get one

I in no way resemble this comment.

 

[TungstenAudio]

(Just returning from checking the store for the second time this morning)
What?

 

[Dennis Hui]

Yes, new trick. I have a snappy name for it too....

What more can you ask for?