Article - Sony VFETs part 1

[Bones13]

I believe that Permender used the schematic from the NP article for the CX1:

http://www.firstwatt.com/pdf/art_sony_vfet_pt1.pdf

I have looked at the board carefully, and it looks to be the exact circuit, including the buffer for single ended input.

I have a question for the panel : I am planning a dual mono amp with the PSUs in a separate case. The main PSU will be directly from the VFET article. Permenders boards take the AC from the bias transformer directly. Could I use a bridge rectifier in the PSU case, so as not to pass AC current from PSU to the amp case? Are there suggestions to do this in a working manner. Or is this low voltage AC just not worth stressing over? I have not arranged the cases, nor purchased power connectors.

 

[Zen Mod]

feel free to route AC for bias though umbilical

no harm and no difference to have it DC

 

[Bones13]

Thanks ZM!

 

[flg]

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.

A master of the pen, amongst other things naturally. thx

 

[Zen Mod]

also known as Mithrandir

or , in Elvish : Poor ZM's Peanut Brain Melter

 

[Michael Rothacher]

You shall not Pass!

 

[Zen Mod]

- Google Search

 

[Zen Mod]

damn , Mr. MR !

that's worthy of Papa's button , just as we already have PWK's button

 

[Michael Rothacher]

That would make a nice T-shirt 🙂

 

[Dennis Hui]

That would make a nice T-shirt 🙂

In time for BA 2015? 🙂

 

[dady]

I am pushing Jama for go together to BA....
The other choice is go alone.

 

[jama]

I would like a lot.... but, this year it is impossible for me.

 

[nicoch58]

we hops that Champagne well be bias hot Nelson

 

[WalterW]

Part 2 is on the First Watt website 😀😀😀

 

[Zen Mod]

finally!

 

[NapIta]

for me the download link is not working. does it work for you?

 

[Zen Mod]

just download what I attached

 

[NapIta]

Thanks for your answer Zen Mod but I do not see any attachment in your post

 

[nicoch58]

http://www.firstwatt.com/pdf/art_sony_vfet_pt2.pdf

 

[NapIta]

Thanks it finally worked later yesterday.