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Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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Old 28th December 2017, 02:20 PM   #3441
wdecho is offline wdecho  United States
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Sony VFET Amplifier Part 2
Quote:
Originally Posted by massimo View Post
As NP specified (TO-3P) couldn't be TO-246 a typo for TO-247?
Probably right. When I searched for TO-246 I came up with TO-247. I am not one to correct the king though. Might lose your head.
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Old 28th December 2017, 06:08 PM   #3442
Nelson Pass is offline Nelson Pass  United States
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Sony VFET Amplifier Part 2
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Originally Posted by tunasto View Post
Will new brackets be 100% copy of old one?
For everyone's convenience, yes, at least in terms of the holes.
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Old 30th December 2017, 07:45 PM   #3443
PJN is offline PJN  United States
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Ah sweet sound of success! After much torture I finally got the bad channel on my VFET squared away. I replaced all of the active components except Q7, Q8, Q9,and Q10. It was much easier to adjust and more stable. I kind of suspected the regs, but since I had it all torn apart went ahead and replaced everything.
i have it burning in in my garage now. First impressions are very good. I'm looking forward to comparing it to my M2. Thanks Nelson for the great design and to everyone for their help and advice.

Paul
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Old 3rd January 2018, 12:13 AM   #3444
Stanney2017 is offline Stanney2017  United Kingdom
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Is there a bill of materials for
The the Sony VFET PCB?
I lucked out and found a pair of 2SK82.

Best.

A
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Old 3rd January 2018, 10:40 AM   #3445
Rodeodave is offline Rodeodave  Austria
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Sony VFET Amplifier Part 2
You can find a BOM in post #2766: Sony VFET Amplifier Part 2
For a working amp you'll need two pairs of 2SK82+2SJ28 VFETs.
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Old 3rd January 2018, 12:12 PM   #3446
RainfallSky is offline RainfallSky  Russian Federation
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Will add a few of observations:

Vishay Dale RN60/CMF60 resistors size are more perfectly fit for pcb resistors size between holes than RN55/CMF55.
Except R32 of course.

C3, C4, C5, C6 - 47uF 35V SILMIC II capacitor size between legs do not fit pcb size between holes. Could be used but with spaces. About ~2.2 mm difference.

And obvious Q5, Q6 - could be Toshiba 2SJ313/2SK2013 if you can find them. Same for Q1, Q2 - could be Toshiba 2SK170/2SJ74.

P.S.: I do not have PCB and components on hands yet.
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Old 3rd January 2018, 02:38 PM   #3447
Stanney2017 is offline Stanney2017  United Kingdom
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Quote:
Originally Posted by Rodeodave View Post
You can find a BOM in post #2766: Sony VFET Amplifier Part 2
For a working amp you'll need two pairs of 2SK82+2SJ28 VFETs.
Many thanks.

Fingers crossed my pair of 2sj28 are on their way.
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Old 4th January 2018, 07:50 AM   #3448
nicoch58 is offline nicoch58  Europe
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Quote:
Originally Posted by RainfallSky View Post
Will add a few of observations:

C3, C4, C5, C6 - 47uF 35V SILMIC II capacitor size between legs do not fit pcb size between holes. Could be used but with spaces. About ~2.2 mm difference.
just drill one new hole at caps diy's...
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Old 4th January 2018, 08:22 AM   #3449
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by Nelson Pass View Post
Single-ended Sony VFETs are in process. At the moment obtaining bracket quotes.

Hi Nelson,
I have interpreted this message as meaning "there will be a SE version" design. Did I miss a post about it or should I be patient and go make a snowman in the mean time?
I have obtained two p-VFETs .
Very curious.
albert
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Old 4th January 2018, 08:28 AM   #3450
massimo is offline massimo  Italy
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Be patient...
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