Article - Sony VFETs part 1

[PKI]

Are we still looking into designing a pcb? This determines what type of transformers we need, wired or not.

 

[dady]

Wired

Are we still looking into designing a pcb? This determines what type of transformers we need, wired or not.

The simplicity of the amp dictate point to point, Jama is finishing his dual mono amp and pcb is a solution for a non existent problem.
Speaking about tastes the last word could be never be pronounced.
Best Regards for you gentlemen

 

[PKI]

But, wouldn't it be nice to have a regulated psu on a boards next to the amp?

 

[Botte]

A PCB would make for a cleaner execution. +1

 

[mctavish]

+2

And with solder pads for the input transformers wires it could be idiot-proof (for dummies like me) and we would have the ability to move the trans. around for the lowest noise/interference.

 

[jama]

First power on

Hello, this is my first power on. I have gotten 1.45A of current and 9mV of DC offset. I think this position of transformers is good. Input of Jensen is short.
The heatsink hot but it is possible touch it.. Load is 8 ohm power resistor. This is a good start....

 

[R-K Rønningstad]

Swell!
Keep the information flowing!

 

[dady]

Very Good Juan Antonio.

 

[jama]

Thank you, but merit is not mine. I only join components following instructions. All merit is of Mr.Pass. I hope use signals today...

 

[Tea-Bag]

Hello, this is my first power on. I have gotten 1.45A of current and 9mV of DC offset. I think this position of transformers is good. Input of Jensen is short.
The heatsink hot but it is possible touch it.. Load is 8 ohm power resistor. This is a good start....

Dear Lord I spy a Brony

 

[vdi_nenna]

Dear Lord I spy a Brony

 

[Tea-Bag]

Well, Tea-Bag don't really judge. But I can be humored easily!

 

[jama]

Dear Tea-bag. I am not a Brony (and if I was, what?). I will tell to my daughter of 7 years old that her lovely wallpaper like very much between diy audio community.
And I think you do not need spy me. All is in the article.
Regards

 

[Tea-Bag]

Dear Tea-bag. I am not a Brony (and if I was, what?). I will tell to my daughter of 7 years old that her lovely wallpaper like very much between diy audio community.
And I think you do not need spy me. All is in the article.
Regards

Forgive me Jama if possible.
My behavior was out of line at your expense.
I have a hard time escaping my own juvenile mind at times.
Your leadership in this project is personally appreciated very much.

 

[jama]

OK. No problem. I like very much this project. And since I joined to diyaudio, 10 years ago, I have wanted contributed something positive. It is a pleasure meet with others passionate people. And I have started before others because in October last year I buyed the Jensen and some VFETs after read the Zen Mod thread. Thanks to all.

 

[jama]

First test

Hello again. I have done some measurements.
0. Equipment used, 1.jpg
1. From 20 Hz to 200KHz (with Zout=50 ohm), 3.jpg and 9.jpg
2. Gain in voltage aprox 3.5, 4.jpg, 7.jpg and 9.jpg
3. To 12 Wrms to 8 Ohm (10Vrms), appear third harmonic
13.jpg, 14.jpg, 15.jpg, 16.jpg and 17.jpg

 

[jama]

More measurements

5. With 27 Wrms to 8 Ohm there are second harmonic too, 24.jpg and 25.jpg
6. Square wave of 20Khz and maximum power output, 20.jpg

Regards

 

[Nelson Pass]

Got yourself a nice smoooooth clip there.

 

[kasey197]

Jama very very nice and thanks for the updates. With the right sort of speakers I'll bet this sounds like heaven

 

[WalterW]

Jama, thanks!!! Did you listen already?