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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 4th April 2018, 07:16 PM   #511
jaab6 is offline jaab6  Canada
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Thank you for your help, have been able to set both side, now I have to assemble the amp and
do it with the cover
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Old 4th April 2018, 07:42 PM   #512
jaab6 is offline jaab6  Canada
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oups I didn't see the next messages! sorry
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Old 19th April 2018, 02:38 PM   #513
Algar_emi is offline Algar_emi  Canada
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Sony Vfet Illustrated build guide
Hi. Is it mentionned somewhere the recommended chassis for this amp? Thanks
SB
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Old 19th April 2018, 03:17 PM   #514
6L6 is offline 6L6  United States
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Sony Vfet Illustrated build guide
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Old 21st April 2018, 03:36 PM   #515
sledwards12375 is offline sledwards12375  United States
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Hello VFET Builders:

I am in the process of getting all of the parts together for my VFET build. A couple of questions. I just read if the MOSFETS I purchased are from Fairchild, I should have increased P3/P4 to 1K ohms. I ordered 500 ohm pots, and the MOSFETS are from ON Semiconductor, which Fairchild is now part of. Should I reorder 1K pots to avoid difficulties when biasing? Is this something that effects some builds and not others?

Secondly, my VFETS have the following Vgs ratings:

2SJ28: 9.6 V 2SK82: 10.3 V

Are these considered a "close enough match" and knowing these values seem somewhat higher than what others have posted, are there any part value changes I should consider before soldering? Thanks in advance.

Steve
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Old 21st April 2018, 05:01 PM   #516
wdecho is offline wdecho  United States
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Order the 1K pots. You will need them with Fairchild.
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Old 21st April 2018, 05:54 PM   #517
Rodeodave is offline Rodeodave  Austria
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Sony Vfet Illustrated build guide
Yup, if you're using the fqp parts, you'll likely need the 1k pots to get to the higher/lower Vgs as compared to the Toshiba parts.

The VFETs are not matched across polarities (n,p), so yours will work fine.
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Old 21st April 2018, 07:19 PM   #518
sledwards12375 is offline sledwards12375  United States
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Thanks for the quick answers, much appreciated.

Steve
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Old 23rd April 2018, 01:26 PM   #519
Arye is offline Arye  Israel
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Default Bridging for Monobloks

Hi to all, I plan to convert two amp kits to monoblocks by bridging operation ( I need more power for my Quad ESL63), I’ve acquired two Jensen JT-123-SS transformers ( like the ones in First Watt F6).
I’d like an advice on the proper placement of the trans’ in the circuit. The more simple will be on the input’ or shell I place them after the Jfet transistor (2sk170’ 2sj74) like in the F6 circuit?
Thanks
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Old 23rd April 2018, 03:35 PM   #520
Zen Mod is online now Zen Mod  Serbia
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Sony Vfet Illustrated build guide
input .

don't mess with circuit .
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