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Gyuri's Pass SONY VFET2 build.
Gyuri's Pass SONY VFET2 build.
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Old 13th September 2017, 04:44 PM   #121
Soundhappy is offline Soundhappy  France
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Gyuri's Pass SONY VFET2 build.
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It sings for more than three hours now.
I'm a happy man, with two Sony VFET amp.
Excellent news bravo Gyuri !
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Old 13th September 2017, 05:34 PM   #122
Gyuri is offline Gyuri  Hungary
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Thank you guys,

But wait a minute, none of them completely ready yet.
They are sing, it is good.
There much chassis work must have to be done.
Bridged mode wasn't tried yet.
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Old 14th September 2017, 07:41 AM   #123
Gyuri is offline Gyuri  Hungary
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Most impressive properties of Sony VFET:

First of all, it has a damned good sound, of course.

Second, there is no noise!
No hiss, no buzz at all, even if I put my ears on the loudspeaker.

This is the quietest one of all I've ever built.
You can not say quietest, it is not the proper expression.
There isn't any noise at all.
Tremendous.
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Old 14th September 2017, 09:05 AM   #124
Gyuri is offline Gyuri  Hungary
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I have a question about bridged mode.
As you can see it from picture above, (sorry for unusual bad quality, I will make better ones.) there are four bridge rectifiers and four cap banks for the two channels.
It means, there are no common ground reference for two independent amp, other than ground of inputs.
One of my solutions for this in similar cases, an external copper rod between negative speaker terminals.
Perhaps it would be better if I put it internally, between ground points of the two PCBs.
Any thoughts?
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Old 14th September 2017, 10:44 AM   #125
Zen Mod is online now Zen Mod  Serbia
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Gyuri's Pass SONY VFET2 build.
copper rod is good enough , if speaker wire coming to negative connector is fat enough

regarding bridging - you want to simply bridge them ( feeding balanced signal etc.) or you want to make them truly differential ?

in case of later - you need pulling both R4s from ground and connect their ends together (in series)

of course , observing DC offset tendencies is a must
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Old 14th September 2017, 12:18 PM   #126
Gyuri is offline Gyuri  Hungary
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Hi ZM,
Thank you for your answers, and questions as well!
Must have to say, I was thinking on first case only.
Most part of my system is true balanced, so I was thinking on first case only.
What could be the benefits of fully differential layout you suggested?
Can I use it in this way as a stereo amp?
Or can I use it in differential mode, and can I revert it by a switch connected in mids of R4s and ground?
Suspect in this case it isn't enough simply switch on, must be setting it from DC viewpoint.
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Old 14th September 2017, 12:44 PM   #127
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Gyuri's Pass SONY VFET2 build.
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.............
-What could be the benefits of fully differential layout you suggested?
.........
-Or can I use it in differential mode, and can I revert it by a switch connected in mids of R4s and ground?....................

-Suspect in this case it isn't enough simply switch on, must be setting it from DC viewpoint.
-benefits - same as comparing usual mumbojumbo balanced vs. SUSY (differential error correction)

-yes , switch will do

-dunno - I didn't tried exact amp in vivo so I can't tell - so you need to check is there any DC offset wandering when switching from one mode to other

naturally - switching while amp is off , just in case
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Old 14th September 2017, 12:50 PM   #128
Gyuri is offline Gyuri  Hungary
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Thanks again, I think I will go on differential way, but first only simply balanced.
We must have the opportunity for development.
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Old 14th September 2017, 01:17 PM   #129
zman01 is offline zman01  Bangladesh
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Gyuri's Pass SONY VFET2 build.
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Second one is up and running!
Congratulations! Double fun...!
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Old 14th September 2017, 02:10 PM   #130
Gyuri is offline Gyuri  Hungary
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Yeah, it was a real fun!
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