need some help for testing my Sony TA4650 vFETs

[bjcwolters]

Hello ,

Sorry for my Englisch.

I Have / had a nice working sony ta 4650.
I did the diode mod.
And after this mod my sony did not work any more.
So i have test the vfet 2sj18 and 2sk60.
did remove them from the Amp.

i have test them with a vom meter
i think the 2sk60 are not good any more
how can i test them ?
housing to G is 60 ohm
housing to S OL
G to S OL

Are they defekt ?

Thanks for help ore info.

Bart Wolters.

 

[adason]

Was it working before you did the mod?

 

[Ben Mah]

Sony Service Bulletin No.62:

 

[bjcwolters]

yes.
Thanks for your help .
i have seen this testing from sony .

 

[Dennis Hui]

Also have a look in this post and the thread:
https://www.diyaudio.com/community/threads/how-can-i-match-v-fets.307603/#post-5075546

 

[Ben Mah]

Resistance reading of OL for Drain to Source is bad news. I would say not much hope. 🙁