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Old 5th February 2014, 12:12 PM   #101
Soundhappy is offline Soundhappy  France
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Edible after sautee with wine?
French don't eat grasshoppers but frogs and
Classic is bread with cheese and little glass of wine with grasshoppers singing at the garden

Back to the topic new article about Sony CES 2014 with Pass Labs inside :

CES 2014 Coverage | Ultra High-End Audio and Home Theater Review

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Old 5th February 2014, 07:12 PM   #102
Soundhappy is offline Soundhappy  France
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Just discovered beauty of vintage transistors

Transistor Museum Construction Projects Point Contact Germanium Western Electric Vintage Historic Semiconductors Photos Alloy Junction Oral History


before we see nano transistor with your dream sound.


Wait patiently if Papa be come back with schematic for Diyers

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Old 6th February 2014, 12:17 PM   #103
R-K Rønningstad is offline R-K Rønningstad  Norway
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Originally Posted by Nelson Pass View Post
Here's a photo of one just before it went off to CES.


I thought I bought enough VFETs from Acronman, but it seems I am a little short.... Well, I do not need 250 W, I need more time!
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Old 6th February 2014, 05:35 PM   #104
Soundhappy is offline Soundhappy  France
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Acronman is a very reliable supplier IMHO.

I'm in the middle of matching 230 pair of K82 and J28, but of the
KE33 rank. I'm testing for Vgs at 20V Vds and 0.5 and 1 amp,
transconductance and Drain resistance.

It's very tedious.


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Last edited by Soundhappy; 6th February 2014 at 05:55 PM.
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Old 7th February 2014, 11:44 AM   #105
Soundhappy is offline Soundhappy  France
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Greetings
Attached Files
File Type: pdf 2SJ18 and 2SK82 Vfet Datasheet.pdf (420.5 KB, 131 views)
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Old 7th February 2014, 01:16 PM   #106
CeeVee is offline CeeVee  Portugal
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Greetings
2SJ28 and 2SK82 :-)
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Old 7th February 2014, 02:25 PM   #107
R-K Rønningstad is offline R-K Rønningstad  Norway
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Default Common source or common drain

Mr Pass, I think I understood from the thread that the output stage is configured as a source follower.
One year ago I did some LTspice modelling with Mr. Rothacher's spice models, but with the output as common source. It seemed to work OK enough, but I never came to work out the details, not to speak about actually build something.

/RK
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Old 7th February 2014, 03:35 PM   #108
Nelson Pass is offline Nelson Pass  United States
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The Sony amplifiers at BAF 2013 were Common Source. The amps shown
at CES were Common Drain.

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Old 7th February 2014, 03:54 PM   #109
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Old 7th February 2014, 03:54 PM   #110
Soundhappy is offline Soundhappy  France
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Thanks CeeVee
You are absolutly right.
Sorry i be little sleepy sometimes.
This is Vfet complementairy pair 2SJ28 and 2SK82 pdf datasheet link
Best regards
Attached Files
File Type: pdf 2SJ28 and 2SK82 Vfet Datasheet.pdf (420.5 KB, 95 views)
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