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-   -   Sony Vfet Illustrated build guide (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide.html)

qwertyl 18th January 2017 11:55 AM

Excellent job as always! Thank you.

Soundhappy 19th January 2017 10:16 PM

Superb work 6L6
Thanks for update

delecoy 20th January 2017 03:00 AM

Quote:

Originally Posted by WalterW (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post4955665.html#post4955665)
This is what Nelson presented how to measure the VFETs

Perfect. Thank you Walter!

dcbingaman 20th January 2017 03:04 AM

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 !

noelectrix 20th January 2017 08:11 AM

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 :D. 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

dimkasta 20th January 2017 08:25 AM

Very nice Jim :)

6L6 20th January 2017 12:20 PM

Quote:

Originally Posted by noelectrix (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post4958152.html#post4958152)
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 -

https://datasheetcafe.databank.netdn.../2SK82-DI1.gif

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

:D :D :D

noelectrix 20th January 2017 12:36 PM

@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!

noelectrix 21st January 2017 02:22 PM

@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.

6L6 21st January 2017 02:35 PM

Warm. But remember that there is no such thing as heatsinks "too big." :D

The Aleph J is certainly much, much hotter.


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