What To Do With Those 2SJ28's

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Greet idea, I am all for a SE project using my 2SJ28's. I have a sets of 2SJ28 and 2SK82 along with boards and brackets for another V-fet build, maybe, but then I was lucky enough to acquire an extra set of 2SJ28's with the hope of a new project one day. Circuitdiy sold out of them pretty quickly once NP introduced the V-fet project so there must be many more holding onto extra 2SJ28's like myself.
 
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I would imagine that they would make a nice DEF amp if you could find
an N ch device with a high enough Vgs voltage.

The 6 to 12 V Vgs figures do make for convenient cascodes.

The last generation of Sony amplifiers used SITs to cascode bipolar devices.
 
ideas to put them to use


Take IRFP140/240 as cascode devices and place them like this:
70361f4452262217acad1586fbdaca8a.png


Then take any opamp and place it in front of that cascode.

Provide enough or even excessive current and enjoy.
 
I'll post a couple of sketches to kick it off when I get in front of my computer.

Title changed! Thanks, Soundhappy.

Oops, it looks like the title changes, but not the actual thread title. Bad Mike :)

Oops is my bad sorry because is only first post title not thread title correction option :eek:

Question: Could autoformer connected gain stage like in M2 or similar with adaptations can play together with v-fet 2SJ28 DEF ?
Moderate price Edcors transformers or Jensens are cool irons.
Not classic Toshiba jfet's front end this time rater make them with small signal sit's 2SK79 ?
 
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