Article - Sony VFETs part 1 - Page 2 - diyAudio
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Old 24th March 2014, 03:29 AM   #11
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I really enjoyed reading that article It's not trivial to put something like that together. Thanks for being so generous Papa.
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Old 24th March 2014, 05:07 AM   #12
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Thanks again<3 mr Pass
Personaly is like Christmass gift to me with a delay
Very appreciated and breath taking article , made with care this is a example of strong giant level work especialy in busy period of time.

Great !

What i have learn quickly:

1* Only two pairs of 2SJ28 / 2SK82 SIT's give two mono chanels

2* NOT MATCHED pairs is ok for this amp !

3* Input XLR and RCA can be adjusted with very simple buffer if need

4* Sony CSX2 amplifier have simpler power supply

5* probably diyAudio store sell PSU pcb's for diyers ( must be verified once )

6* This is not big bucks build is rather economic

7* This is sound unique SIT push-pull class A amplifier

8* Match very well with big magnets alnico speakers drivers

Many good news and sir Nelson Pass you are the Champion!
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class A amplifiers with full range speakers
sings like angels in heaven
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Old 24th March 2014, 06:55 AM   #13
dady is offline dady  Balearic Islands
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I Got in this pages enough information for a couple of weeks. Following the news about Vfet, from the DIYaudio wind, I acquired two couples of 2sk82/J28. I wait for the news that come from the cyberspace: The temptation is high and hard to control the human/animal impulses.

Best Regards to the group and in advance: Many thanks for the incredible knowledge you are spreading among the mortals from the world.
Esteban Bikić

Last edited by dady; 24th March 2014 at 07:00 AM.
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Old 24th March 2014, 09:57 AM   #14
Dzius is offline Dzius  Poland
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Would it work like this ?
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Old 24th March 2014, 04:17 PM   #15
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Originally Posted by Dzius View Post
Would it work like this ?
Attachment 407891
If you had very quiet rails it would. The output would be inverted, which
is not a problem, and I think you would want to raise the resistor values
to something more like 10 Kohm.

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Old 24th March 2014, 04:33 PM   #16
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Originally Posted by Nelson Pass View Post
At last, the first of the Sony VFET articles is done and posted at



You are completely amazing! Just the list of what you have accomplished in several months is staggering!

Thank you. But, it just doesn't cut it. We need your face on Mount Rushmore!

I build, therefore I am.
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Old 24th March 2014, 05:51 PM   #17
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Great article, Nelson. I keep finding something more with each read-through.

Ordering my transformers now.
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Old 24th March 2014, 05:53 PM   #18
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That's a pretty serious power supply. Time for me to order some parts.
I guess it wouldn't be a bad idea to have separate heatsinks for the regulators.

We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
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Old 24th March 2014, 06:00 PM   #19
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I just spoke to Jensen. They're out of stock, but it sounds like they're going to do a production run very shortly.

I warned them about you guys.
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Old 24th March 2014, 06:03 PM   #20
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I guess something like the Lundahl LL 1527 could be used. But maybe overly expensive on your shores.
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