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-   -   Sony Vfet Illustrated build guide (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide.html)

6L6 17th January 2017 06:21 PM

Fixed. Thanks! :D

Dennis Hui 17th January 2017 06:31 PM

Great job Jim!

Russellc 17th January 2017 06:51 PM

I see the boards available, is it possible to get in a line somewhere, or are the output transistors all gone?

Russellc

Dennis Hui 17th January 2017 06:57 PM

Quote:

Originally Posted by Russellc (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post4955108.html#post4955108)
I see the boards available, is it possible to get in a line somewhere, or are the output transistors all gone?

Russellc


Hi Russellc,

Sign up while you still can. Please see this post:

http://www.diyaudio.com/forums/pass-...ml#post4954013

Dennis

Zen Mod 17th January 2017 07:03 PM

damn

6L6 again faster than Mighty Moi

:clown:

DynaudioFan 17th January 2017 07:18 PM

Fantastic. Thanks for this.
Your work is much appreciated

vdi_nenna 17th January 2017 07:49 PM

Anyone know the price for the kits? Search turns up nothing.

PJN 17th January 2017 09:01 PM

A little bit over two hundred bucks depending on postage

delecoy 18th January 2017 03:12 AM

Measuring v-fets Vgs for starting bias point
 
Thank you Jim! The case for my vfet amp arrived today so I will be following closely :)

I do have one question: I know the article presupposes that one bought the full vfet kit ( which I did ) - but I also bought vfets long before the kits were released. How would I go about measuring them ( safely obtaining an accurate Vgs ) to set the right bias point if that was all I had? Guessing there will be others in that boat with vfets they cant afford to mistakenly burn.

Not looking a gift horse in the mouth. I will be forever grateful for your help on my BA3FE and F4 :)

Thank you much!

NP from he Sony Vfet Part 2 article:
"I matched the VFETs for a Vgs within 0.1 volts at 0.5 amp current at 20 volts, and 0.2V Vgs is good enough. Some of you won't have good matches or only enough VFETs for 1 pair per channel, but you can build the amplifier and it will work fine, with somewhat less power and higher distortion. I tested that with 1 amp bias current, and it did just under 20 watts into 8 ohms."

WalterW 18th January 2017 07:30 AM

1 Attachment(s)
Quote:

Originally Posted by delecoy (https://www.diyaudio.com/forums/pass-labs/302380-sony-vfet-illustrated-build-guide-post4955535.html#post4955535)
Thank you Jim! The case for my vfet amp arrived today so I will be following closely :)

I do have one question: I know the article presupposes that one bought the full vfet kit ( which I did ) - but I also bought vfets long before the kits were released. How would I go about measuring them ( safely obtaining an accurate Vgs ) to set the right bias point if that was all I had? Guessing there will be others in that boat with vfets they cant afford to mistakenly burn.

Not looking a gift horse in the mouth. I will be forever grateful for your help on my BA3FE and F4 :)

Thank you much!

NP from he Sony Vfet Part 2 article:
"I matched the VFETs for a Vgs within 0.1 volts at 0.5 amp current at 20 volts, and 0.2V Vgs is good enough. Some of you won't have good matches or only enough VFETs for 1 pair per channel, but you can build the amplifier and it will work fine, with somewhat less power and higher distortion. I tested that with 1 amp bias current, and it did just under 20 watts into 8 ohms."

This is what Nelson presented how to measure the VFETs


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