Sony VFET Amplifier Part 2

[mbrennwa]

Maybe this pair of fully built Sony PP boards is interesting for you guys:
https://www.diyaudio.com/community/...-boards-curve-matched-vfets-available.407200/

 

[Abraxas336]

Any views on whether these are genuine parts?
Thanks
Sven

 

[Zen Mod]

they look as they are

why should anyone fake those?

 

[Abraxas336]

Thanks. Just wanted to make sure, the weirdest things are being faked these days and at least where I live they only seem to be available from small vendors at a relatively high price.

 

[Zen Mod]

simple test with universal tester will say everything needed

 

[Dennis Hui]

the weirdest things are being faked these days

It's good to be cautious and test them before use. Heck, recently a member bought fake ZTX450/ZTX550 and they're in production and easily available...

 

[andrew_whitham]

Any views on whether these are genuine parts?
Thanks
Sven

only because of the thread and "someone's" got to say it: real or not, they are not vfets

 

[Abraxas336]

Thanks, I know that. Still needed for the amplifier discussed in this thread though.

 

[mbrennwa]

Ha! Maybe I should start collecting IRF pucks and do a group buy for Sony VFETs + IRF puck combos

 

[Dennis Hui]

Thanks, I know that. Still needed for the amplifier discussed in this thread though.

It's perfectly fine to use the TO-247 versions (IRFP240/IRFP9240) though some might prefer the look of the TO-3 parts.

 

[Abraxas336]

Yes

 

[Wire Nut]

I have had 7 Sony Vfet amps and none of them looked like that. A "tech" used a variac on one (blew all of them up) and I bought some "Vfet's" on Ebay to replace them and they were fake Chinese.... some sellers have no shame!

 

[Zen Mod]

I understood that Abraxas is asking for these, having on mind Papa's Sony VFet amp having exactly these mosfets as rails conditioners

I'm sure that I understood correctly

 

[arky]

Hi All.

Just another build of Rev-2 with Teabag boards. However, now used 3 pairs of k82/j28 per channel and the Front End is powered by separate regulated PSU +/-33V from separate trafo. Also adjusted rails from +/-19 to +/-24, to be a bit closer to 40-th anniversary commemorative thing. The amp is giving 15.2V RMS before clipping at 4ohms dummy load, so it is about 58 WPC. Bandwith is narrow than original, going to moderate decline from 40kHz. Biased at 1 amp per channel.

 

[mbrennwa]

Yummy!