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Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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Old 27th September 2018, 07:20 PM   #3641
Nelson Pass is offline Nelson Pass  United States
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Sony VFET Amplifier Part 2
I have the 2SK60 and 2SJ18's, and I think the 16's should work also.
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Old 28th September 2018, 09:59 AM   #3642
Chul is offline Chul  South Korea
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Sony VFET Amplifier Part 2
Quote:
Originally Posted by Nelson Pass View Post
I have the 2SK60 and 2SJ18's, and I think the 16's should work also.
Please tell me Nelson, are four 2SK60s in parallel are comparable to one Pass-SIT, or worthy of trying in any circuit including DEFiSIT?
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Old 28th September 2018, 06:31 PM   #3643
Nelson Pass is offline Nelson Pass  United States
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Sony VFET Amplifier Part 2
One 2SK60 is roughly a single SIT-1 transistor. No need to parallel.
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Old 29th September 2018, 03:50 AM   #3644
Chul is offline Chul  South Korea
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Sony VFET Amplifier Part 2
Quote:
Originally Posted by Nelson Pass View Post
One 2SK60 is roughly a single SIT-1 transistor. No need to parallel.
A Zen answer to an ignorant question...
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Old 9th November 2018, 05:22 AM   #3645
flocchini is offline flocchini  United States
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Default Put...Put...Put

I just switched from 89dB speakers to 94dB speakers.
Using TeaBag VFET2 boards with Botte suggested changes

With CLC PSU using 25V transformer: .
If I put my ear very close to the speakers I hear a put.. put.. put. Frequency is about a beat per second. Same for both speakers. At listening position can't hear the put put put - just great sound

Repeated using 22V transformers - same thing

Switched to a different CLC PSU using 18V transformer - no put puts

Thoughts anyone???

Much appreciated and thanks

Bob
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Old 9th November 2018, 06:46 AM   #3646
Zen Mod is offline Zen Mod  Serbia
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Sony VFET Amplifier Part 2
from yeah putput to nay putput , you changed either wiring ......... or more likely - you changed damaged cap
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Old 9th November 2018, 02:27 PM   #3647
Russellc is offline Russellc  United States
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Sony VFET Amplifier Part 2
Quote:
Originally Posted by Blk Dynamite View Post
Just curious if anyone knows of the UMS compatible TO3 mounting brackets will ever be in stock again?
Is this still the case? (That these brackets will return to store) I notice they are no longer pictured...EEEK!

Russellc
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Old 9th November 2018, 02:39 PM   #3648
flocchini is offline flocchini  United States
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Quote:
Originally Posted by Zen Mod View Post
from yeah putput to nay putput , you changed either wiring ......... or more likely - you changed damaged cap

ZM

In the 22V and 25V setups I also changed the cap bank - still the same
putt-putt

I'll check wiring today

Something with regulators ????
18VAC not enough to fire them up ????

It's irritating and hopefully doesn't damage the speakers

Thank you
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Old 9th November 2018, 03:14 PM   #3649
Zen Mod is offline Zen Mod  Serbia
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Sony VFET Amplifier Part 2
aha

now you tells more ....

with PSU voltage - to have putput , try (temporary) "shorting" R20 (schm from post #11)

but!! "shorting" means not dead short (offset issue ) but just AC shorting with , say, 470uF cap , neg pole to gnd

idea is isolating FE from OS

if putput is gone , FE is culprit

is putput ( I like that worrrrrrrd!) is still there , OS is culprit

then we can go further
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Last edited by Zen Mod; 9th November 2018 at 03:17 PM.
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Old 9th November 2018, 04:32 PM   #3650
flocchini is offline flocchini  United States
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Again thank you ZM
Will do this during the weekend
Best
Bob
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