Pass "DeLite" Amp from BAF - diyAudio
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Old 20th October 2009, 08:31 AM   #1
Vix is offline Vix  Yugoslavia
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Default Pass "DeLite" Amp from BAF

EDITORS NOTE: This is the single depletion mode Mosfet amp that Nelson Pass demonstrated at Burning Amp this year. END



Quote:
Originally Posted by Nelson Pass View Post
I just opened an unexpected arrival from Jon this morning....
After seeing this, who can resist?

(Tea-bag, thanks for the photo)

Quote:
Originally Posted by Nelson Pass View Post
It's worth noting that I am considering some other tweaks
on this as well.
J-fet CCS?
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Last edited by Variac; 27th October 2009 at 10:35 PM.
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Old 20th October 2009, 02:55 PM   #2
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by Jon Ver Halen View Post
. After hearing his simple power J-fet SE amp at Burning Amp, I feel even stronger that this deserves to be explored.

Hopefully, my F2 will receive a transplant, and I will report back later.
John, you mean this beast?
This was a depletion mode mostfet amp, not JFET, which I thought sounded lively and promising. I wonder if an F2 like charging cap would help here with turn on thump. He also ran the J2 into the feastrex as well.
I hope Nelsons doesn't black list me for posting the chalk board lesson schematic. I assume the article will be worth waiting for, since he had only spent a few hours with it. May not be a final version.
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Last edited by Tea-Bag; 20th October 2009 at 03:02 PM.
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Old 20th October 2009, 04:27 PM   #3
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Quote:
Originally Posted by Tea-Bag View Post
John, you mean this beast?
This was a depletion mode mostfet amp, not JFET, which I thought sounded lively and promising. I wonder if an F2 like charging cap would help here with turn on thump. He also ran the J2 into the feastrex as well.
I hope Nelsons doesn't black list me for posting the chalk board lesson schematic. I assume the article will be worth waiting for, since he had only spent a few hours with it. May not be a final version.
Correct on all counts. I think we're going to have some
DIY fun with this one, as it sounds far better than it has
any right to.

I chose the Ixys depletion mode Mosfet because you guys
can buy it from Digikey for $6 (plus I wanted to play with
it). I also have several types of depletion mode JFETs, but
none of them are available and/or practical.

This will change, even if I have to get them made and
sell them myself.

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Old 20th October 2009, 04:30 PM   #4
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Nelson Pass View Post
......

This will change, even if I have to get them made and
sell them myself.



seriously

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Old 20th October 2009, 04:34 PM   #5
massimo is offline massimo  Italy
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Good Nelson, a real new Zen amp (1 single device) 15 years after!
But here in Europe we might have some problems nowadays as big bulbs (100 W) are no longer available in the shops by law. We must use electronic "green" bulbs only and "save the planet"!

Last edited by massimo; 20th October 2009 at 04:36 PM.
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Old 20th October 2009, 04:37 PM   #6
Vix is offline Vix  Yugoslavia
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Quote:
Originally Posted by Zen Mod View Post


seriously

This beautiful amp only needs a fugly wooden box.

Now, just a bit more: How 'bout a YBSOZ (Young Brother of Son of ZEN) with Ixys depletion mode Mosfets?

That would be an amp!!

Btw, as always, thanks Papa!
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Old 20th October 2009, 04:40 PM   #7
Vix is offline Vix  Yugoslavia
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Quote:
Originally Posted by massimo View Post
Good Nelson, a real new Zen amp (1 single device) 15 years after!
But here in Europe we might have some problems nowadays as big bulbs (100 W) are no longer available in the shops by law. We must use electronic "green" bulbs only and "save the planet"!
Massimo, I had built an F2 with lightbulbs. I used some halogen 1500w sticks. Maybe you can still find them around....
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Old 20th October 2009, 04:43 PM   #8
labjr is offline labjr  United States
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What are the lamps for? Gnd ?
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Old 20th October 2009, 04:46 PM   #9
Zen Mod is offline Zen Mod  Serbia
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Originally Posted by labjr View Post
What are the lamps for? Gnd ?
load;

look at picture from BAF - Papa in front of school board ;

who was a teacher ?

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Old 20th October 2009, 04:53 PM   #10
massimo is offline massimo  Italy
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Originally Posted by Vix View Post
Massimo, I had built an F2 with lightbulbs. I used some halogen 1500w sticks. Maybe you can still find them around....
Those should be still available.
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