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Sony Vfet Illustrated build guide
Sony Vfet Illustrated build guide
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Old 8th July 2019, 12:48 PM   #841
Zen Mod is offline Zen Mod  Serbia
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Sony Vfet Illustrated build guide
that's in short as I would do it , without desoldering anything ..... most likely even without touching NFB

but , as I said - with fuses in rails , just in case
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Old 8th July 2019, 02:34 PM   #842
nashbap is offline nashbap  United States
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Lift one end of R19 and R20. This does not let current flow thru the IRF's. Set your VFET gate voltages 1V more as in the instructions and adjust FE bias.. Then reconnect R19 and R20 and adjust. Papa suggests this method for the original two pair version.


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Old 8th July 2019, 03:21 PM   #843
Marra is offline Marra  United Kingdom
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Sony Vfet Illustrated build guide
Thanks guys I will get on it tomorrow.
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Old 9th July 2019, 06:20 PM   #844
ichiban is offline ichiban  United States
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Sony Vfet Illustrated build guide
Default SONY VFet supplants F4 ?

It was a knock down dragged out battle but,
in the end I got the beast biased up.

Space is very tight in this 4U chassis.
Have to find something to vertically
mount the transformer and better position
the diode bridges.

So, how does it sound?
My fave has been then the F4.
I have yet to do a back & forth
with the two, but it may be my
new fav amp.
Seems to reveal more detail/nuance.
Searching for an apt discription and
will say it is less congested during
bursts with a lot going on, ease/coherent?
I like it .

Listened to it first with the B1Korg,
but going direct in from the Twisted
Pear SABRE-PRO38, sounds cleaner
revealing more.

My gratitude to Mr. Pass for giving
us yet another superb amplifier.

My only regret is waiting two+ years
since buying it from the diyaudio store.
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Old 10th July 2019, 05:58 PM   #845
Nelson Pass is offline Nelson Pass  United States
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Old 10th July 2019, 06:18 PM   #846
Zen Mod is offline Zen Mod  Serbia
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@ichiban

whatever you say about F4 , 90% of that is about preceding stage ( preamp) , 10% about F4 itself

I'm just being picky , expecting that Greedy Boy(z) always say what's in front , when speaking of F4



glad that you are enjoying your new Papamp
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Old 10th July 2019, 07:32 PM   #847
ichiban is offline ichiban  United States
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Sony Vfet Illustrated build guide
B1Korg is fronting the F4.

Still have to pit the two, F4 vs VFet,

against each other.

At the moment listening to the VFet.





Quote:
Originally Posted by Zen Mod View Post
@ichiban

whatever you say about F4 , 90% of that is about preceding stage ( preamp) , 10% about F4 itself

I'm just being picky , expecting that Greedy Boy(z) always say what's in front , when speaking of F4



glad that you are enjoying your new Papamp
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Old 10th July 2019, 08:50 PM   #848
Dennis Hui is online now Dennis Hui  Canada
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Sony Vfet Illustrated build guide
Vfet vs F4. What a wonderful problem to have.

Congratulations!
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Old 12th July 2019, 08:07 PM   #849
Marra is offline Marra  United Kingdom
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Thank you guys I am happy to say that the amp is now biased up and running. I have been listening to it in conjunction with the B1 Nutube a marriage made in heaven imho. A huge thank you to Nelson for releasing these to the diy community. Like ichiban it has taken me two years to finally complete the vfet amp.


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Old 12th July 2019, 09:05 PM   #850
nashbap is offline nashbap  United States
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Quote:
Originally Posted by Marra View Post
Thank you guys I am happy to say that the amp is now biased up and running. I have been listening to it in conjunction with the B1 Nutube a marriage made in heaven imho. A huge thank you to Nelson for releasing these to the diy community. Like ichiban it has taken me two years to finally complete the vfet amp.


Attachment 767886

Attachment 767887

Great! Let us know your impressions with your DCG3.
nash
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