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Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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Old 14th November 2018, 07:24 PM   #3681
flocchini is offline flocchini  United States
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Rodeodave

Hard to tell about my 431s - On those I can read it says 431c
Have ordered A version and in the process of changing caps

Thanks

Bob
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Old 14th November 2018, 08:08 PM   #3682
Botte is offline Botte  United States
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Quote:
Originally Posted by nashbap View Post
Thanks Botte. Your response helps to clear up things. Mine is a new build so I will go with C1,C2 at 220uf and C3,C4 at 47uf, all the rest 220uf.
I realize that we all have different brand preferences for caps. What brand here seems to have worked best for you? Also what voltage should these be? Bypass or not since the board has provision for it?


Nash
I use the Elna SILMIC II Series 50V for the bootstrap 35 for the rest. I do bypass them with the vishay MKP 1837.
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Old 14th November 2018, 08:51 PM   #3683
nashbap is offline nashbap  United States
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Originally Posted by Botte View Post
I use the Elna SILMIC II Series 50V for the bootstrap 35 for the rest. I do bypass them with the vishay MKP 1837.

What value 1837?


Thanks again.


nash
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Old 14th November 2018, 09:32 PM   #3684
flocchini is offline flocchini  United States
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Default Tractor is gone

Thank for all your help guys

Changed C1,C2 to 220uF and C3,C4 to 50uF (2 100uF in series) as suggested and didn't hear a putt putt.

Will re-bias later today.

Again many thanks !!!!!!

Best

Bob
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Old 15th November 2018, 06:49 PM   #3685
Botte is offline Botte  United States
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Quote:
Originally Posted by nashbap View Post
What value 1837?


Thanks again.


nash
.01uF

https://www.mouser.com/ProductDetail...uyBVyjPLnYo%3d

See http://www.humblehomemadehifi.com/Cap.html
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Old 17th November 2018, 04:06 PM   #3686
BDP is offline BDP  United States
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Originally Posted by nashbap View Post
Any reason you have omitted C7,C8?


Thanks.


Nash
Nelson showed a plot with and without the bootstrapped output mod and the only difference I could see was that the output power increased.

Nelson also showed a distortion plot of different Vds voltages and the one operating at 25 volts had the lowest distortion figure.

I will probably try both versions.

BDP
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Old 17th November 2018, 05:30 PM   #3687
flocchini is offline flocchini  United States
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Biased to 1.5A

Everything is sounding great

Thanks again Botte and ZM
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Old 17th November 2018, 07:38 PM   #3688
nashbap is offline nashbap  United States
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Thanks, will incorporate. nash
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Old 17th November 2018, 07:40 PM   #3689
nashbap is offline nashbap  United States
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Quote:
Originally Posted by BDP View Post
Nelson showed a plot with and without the bootstrapped output mod and the only difference I could see was that the output power increased.

Nelson also showed a distortion plot of different Vds voltages and the one operating at 25 volts had the lowest distortion figure.

I will probably try both versions.

BDP

Thank you for explaining. nash
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Old 5th December 2018, 10:08 PM   #3690
BDP is offline BDP  United States
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Been listening on the main system of a few weeks now. This to me is much better than the Version one. It has much detail without being bright sounding and the bass is better defined.


I will swap in my f3's, which have been my favorite amps and see how they compare.


I built both the M2 and Sony Ver 1 which both have the input transformers and they were just not to my liking, not bad by any means, just didn't capture my attention when I go through my music collection. Just my two cents worth?
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