Article - Sony VFETs part 1

[WalterW]

haahaha 🙂

 

[Nelson Pass]

True.

 

[CeeVee]

maybe ZM Assen euphoria 😀

...well forgive him...i fully understand...Vale was simply amazing!!!!

😀😀

 

[Nelson Pass]

As a run up to the presentation of part 2, I have posted the original 2013
article Sony VFET 40 Year Commemorative Amplifier

You will find it under articles at FIRST WATT

This is the big brother of the DIY Sony VFET part 2

And there is great honor for he who spots the error in the simplified schematic.

 

[Zen Mod]

JFets are in place regarding polarity , but you need gates crossed , comparing to schm as is now

 

[Zen Mod]

and few shorts , here and there

though , I need strong coffee now , working on PCs for last 6 hours

need time for switching to Papapuzzles

 

[nicoch58]

thanks !!

 

[Michael Rothacher]

So, you've been holding out on us since 2013, eh? 🙂

I jest. Thanks, Nelson.

Where are the amps now? Are they still touring?

 

[Zen Mod]

they're smashed

in OPLDF



edit :

God , give us that everyone is holding on us , as Papa is doing .......

 

[damuffin]

I counted 28 sit devices in the photo. I only have 4.

 

[Botte]

I counted 28 sit devices in the photo. I only have 4.

It's actually 24 sits with 4 irf regulators and that's mono......

48 required for stereo 🙄

 

[Zen Mod]

and few shorts , here and there

though , I need strong coffee now , working on PCs for last 6 hours

need time for switching to Papapuzzles

here , after some coffee , still principle/basic schematic but drawn more logical

Mighty ZM , never hesitating to be dumb , in public

 

[bogdan_borko]

here , after some coffee , still principle/basic schematic but drawn more logical

Mighty ZM , never hesitating to be dumb , in public

edt

 

[Soundhappy]

Thanks a lot sir Pass

Sony Big Commemorative sound very excellent and diyers can dream about.
It was first version with white bricks source resistors ?

https://www.youtube.com/watch?v=MNEt2XXOkYo

1 pair , 2 matched or 4 pairs topology are realistic for diyers
and it be lot of joy to constructs this amplifiers
Please Papa bring us little schematic for match technique target circuit.
Transistors poofff i ready know
Kind regards

ps. what happen with nice classic cool emoticone ?

 

[Nelson Pass]

Leave it to ZM to come in and scoop up the glory.

My edit simply swapped the voltage values.

 

[Zen Mod]

.......

My edit simply swapped the voltage values.

yup

I'm used to see you ridicule common social relations/establishments , but this time that would be too general , even for simplified schematic



(rest of Greedy Boyz are maybe forgotten that mess you made with misplaced dot in F6 , but I remember how it almost melted my brain .... )

 

[WalterW]

I guess this scaled down version must be possible to build. Though I have to order some extra VFET's 😀
The transistors, if I read right, will be like a balanced BA3 front end but with cascoding.
So probably 2sj74bl/2sk170bl JFETs with 2sj313/2sk2013 MOSFETs....
Cascoding BJT's probably 2sc4793/2sa1837.

 

[Zen Mod]

being in Europe , it's completely normal to use BD139/BD140

 

[wdecho]

I have been fortunate to acquire a pair of permaneder boards from a gracious member and notice that the input voltage is 32 volts so I am to assume the voltage is regulated down to 23 volts on the board. Does anyone have a schematic for the boards? I notice that the buffer is also included on the boards.

David

 

[anilva]

I have been fortunate to acquire a pair of permaneder boards from a gracious member and notice that the input voltage is 32 volts so I am to assume the voltage is regulated down to 23 volts on the board. Does anyone have a schematic for the boards? I notice that the buffer is also included on the boards.

David

AFAIK, Permaneder boards had everything on the PCB, including the ref voltage regulators etc. One had to just give the 32 volts input and the the required 12V stuff. The input buffer is also part of the VFET Part 1 article. I managed to get a pair of similar boards from a member as well.

Cheers.