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Old 25th April 2017, 06:08 PM   #11
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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.
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Old 25th April 2017, 06:09 PM   #12
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To call the mods attention, hit the red triangle at the left of the screen, then ask them to make the change.
Ah, thank you. Just saw your post.
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Old 25th April 2017, 06:34 PM   #13
BesPav is online now BesPav  Russian Federation
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Originally Posted by Michael Rothacher View Post
ideas to put them to use

Take IRFP140/240 as cascode devices and place them like this:
Click the image to open in full size.

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

Provide enough or even excessive current and enjoy.
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Old 25th April 2017, 06:37 PM   #14
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BesPau, you draw NJFETs, the guy has PJFET's. 2SJ's are PJFET's. 2SK's are N.
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Last edited by Osvaldo de Banfield; 25th April 2017 at 06:41 PM.
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Old 25th April 2017, 06:47 PM   #15
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Originally Posted by Michael Rothacher View Post
Aw geez, I meant 2SJ28's. That's embarrassing, now my thread has a very misleading title


Mended now
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Old 25th April 2017, 06:47 PM   #16
BesPav is online now BesPav  Russian Federation
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Quote:
Originally Posted by Osvaldo de Banfield View Post
BesPau, you draw NJFETs, the guy has PJFET's. 2SJ's are PJFET's. 2SK's are N.


Oh, you are clearly right, sorry, i must check datasheet.
Than just pick IRFP9140/9240 and reverse polarity...
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Old 25th April 2017, 07:03 PM   #17
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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

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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Old 25th April 2017, 07:10 PM   #18
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Thanks to Karl (Mooly), always very attentive.

Don't worry, all we are human, and make mistakes. Are we human?
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Old 25th April 2017, 07:21 PM   #19
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Mended now
Thank you, kind sir. Now we're off to the races.
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Old 25th April 2017, 08:10 PM   #20
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I still don't know what to do with my vfet N/P pairs.
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