Article - Sony VFETs part 1

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#361
DIYspaceW said:
Congrats soundhappy!

Waw, will you parallel them or why do you need so many? 🙂
Click to expand...

Hi DIYspaceW

Congratulation more too You for Sony vfet parafeed diy amp
ready build and good example for me 🙂

http://www.diyaudio.com/forums/pass-labs/245321-hybrid-sit-parafeed.html

Yes Vfet's is for parallel devices for Common Drain Part 2 amp i dream build symmetric one but maybe i am short after matched pairs ?
Anyway today i collect parts for CSX1
Probably Mr Pass is busy in lab and from time to time write next line of his thrill article:note:
Greetings
 
#362
Parallel universe

soundhappy said:
Hi DIYspaceW

Congratulation more too You for Sony vfet parafeed diy amp
ready build and good example for me 🙂

http://www.diyaudio.com/forums/pass-labs/245321-hybrid-sit-parafeed.html

Yes Vfet's is for parallel devices for Common Drain Part 2 amp i dream build symmetric one but maybe i am short after matched pairs ?
Anyway today i collect parts for CSX1
Probably Mr Pass is busy in lab and from time to time write next line of his thrill article:note:
Greetings
Click to expand...

How many do you want to parallel?

By the way my sit is going to get an input transformer....Update..
 
#364

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#365
Vfet pairs for balanced amp how many need ?

Nelson Pass said:
Another correction: The big version is balanced, and not all of the devices
are VFETs - there are also supply regulators.

So instead of 30 Vfets, each output polarity has 6 pairs, or 12 devices, and
you will be aware that they only have to slew half as fast as well, making the
performance the equivalent of an unbalanced 3 pair in terms of the effective
capacitance.

😎
Click to expand...
Finaly find response but things maybe change ?
Best regards
 
#367
Hello DIYspaceW, I have done the amplifier. It is wonderful. But for my 86db speakers I need more power. My room is small (9m2) and when speaker begin to sound well, appear a little of distortion (and DC protector works!). I need more watts. With this power supplies, amplifier dissipate more of 100 watts and I suppose we can increase the voltage, but we need dissipate more watt from SITs. My heatsinks are big (0.25-0.3 ºC/W) and in half an hour they are hot, and transistors it is not possible touch with hand.
 
#372
I have heard the piano of jama and the orchestra with this amplifier.
It sounds well, but sometimes it needs more power.
High power rates create something of distortion and after some minutes a little bit of DC offset.
The DC protection of loudspeakers switched off the speakers in half of the hearing.
Today I have bought two vintage Zenith speakers.
I will make experiments. 🙂
 
#373
So it looks like Acronman only has pairs of 2SK82 KE-33 and 2SJ28 KF-33 left. I have not bought my 2 pairs yet (zero play money🙁) and I am just wondering if different ranked pairs will work with this design?

Have I missed the boat or will these still work?

Must I now beg some benevolent member who has extra for 2 pairs?😱🙁
 
#377
Hey mac, what you think in make a tool for measure each vfet of the group follow by publications of the results and trying to close match them for the next project of Common drain?
I have four pairs. All KE series. But somebody with more experience could suggest some.
Best Regards.
 
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