Sony Vfet Illustrated build guide - Page 3 - diyAudio
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Old 18th January 2017, 11:55 AM   #21
qwertyl is offline qwertyl  United Kingdom
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Excellent job as always! Thank you.
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Old 19th January 2017, 10:16 PM   #22
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Superb work 6L6
Thanks for update
Click the image to open in full size.
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Old 20th January 2017, 03:00 AM   #23
delecoy is offline delecoy  United States
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Quote:
Originally Posted by WalterW View Post
This is what Nelson presented how to measure the VFETs
Perfect. Thank you Walter!
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Old 20th January 2017, 03:04 AM   #24
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Default Perfect Timing !!!

6L6, all my parts show d up today so I just looked on DIYAudio to see if you had started on the build guide. Low and Behold here it is ! Fantastic job. Looking forward to your updates !
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Old 20th January 2017, 08:11 AM   #25
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post#3

Quote:
It is extremely important to understand that the case of the TO-3 Vfets is conductive, and the only connection of source to the circuit. Therefore the cases must be attached properly, and the proper washers used. Bolt from the top, small washer, lock washer, nut. Make sure everything is secure and well-aligned, then solder the pins.
First time i thought about it in detail . The case of V-fet will most probably have connection to case/safety ground via the screw. So why do we use a mica washer?
Mhm, i must be wrong, but in my thinking connection to ground is given even with washer because of the screw and all metal housing of V-fet.

tnx,
stefan
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Old 20th January 2017, 08:25 AM   #26
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Very nice Jim
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Old 20th January 2017, 12:20 PM   #27
6L6 is offline 6L6  United States
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Quote:
Originally Posted by noelectrix View Post
The case of V-fet will most probably have connection to case/safety ground via the screw. So why do we use a mica washer?
... but in my thinking connection to ground is given even with washer because of the screw and all metal housing of V-fet.


The pinout of the Vfets is here -

Click the image to open in full size.

Mica is used as we don't want to have the Drain connected to chassis ground.

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Old 20th January 2017, 12:36 PM   #28
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@6L6
tnx : ), what i ignored, was the fact that screw is isolated against alloybracket via PCB at the bottom. Screw touches PCB and not the bracket itself!
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Old 21st January 2017, 02:22 PM   #29
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@6l6; Hi Jim, how hot does it go? Is it more Aleph J (hot) or more F6 (warm) like?

I wonder if 30cm x 10cm (or 12cm) is sufficient. Guess your build has 30cm x 15cm?

happythanx,
st.
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Old 21st January 2017, 02:35 PM   #30
6L6 is offline 6L6  United States
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Warm. But remember that there is no such thing as heatsinks "too big."

The Aleph J is certainly much, much hotter.
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