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-   -   new aleph to be built..? (http://www.diyaudio.com/forums/pass-labs/19545-new-aleph-built.html)

george a 28th August 2003 09:49 PM

new aleph to be built..?
 
Hi all

I may well just try building an aleph using about 12 2sk134 TO3 mosfet as per moamps effort etc.

But that leaves me with 12 of 2sj49 mosfet (compliment to 2sk134) to find a use for.
any suggestions?

Can "a negative" version of an Aleph be built with these-

you can probably tell i'm possibly getting out of my depth.

Apologies Mr. Pass... you must be shaking your head.

regards to all

Nelson Pass 29th August 2003 03:08 AM

The negative would work just fine. Simply use reverse
polarities on all parts.

moamps 29th August 2003 08:58 AM

2 Attachment(s)
Maybe this schematic .........

joensd 29th August 2003 09:17 AM

What about ZenV5?
Itīs complementary design, very simple and you could lower gain, parallel devices and add aleph input stage or whatever you like.

moamps 29th August 2003 12:06 PM

Or left mono block with Pch FETs, right with Nch FETs !? :idea:

george a 29th August 2003 12:22 PM

Thank you all for your replies.
Moamps , did you just happen to have the schematic lying around?

The Pos & Neg monobolc idea also passed through my mind, I wonder if they would sound different (mirror image..)

Nelson thanks for your prompt and (since it came from you ) encouraging reply.
Looks like I have another project to ad to the list of things to do.


Regards to all.

ps Nelson did you have anything to do with an old Threshold Moving Coil head-amp some 20yrs ago ?
(had 7 of paralleled 2n4401 in it)- an excelent (to my ears at least ) unit

moamps 29th August 2003 12:37 PM

Quote:

Originally posted by george a
Thank you all for your replies.
Moamps , did you just happen to have the schematic lying around?

I have 8 pcs. 2SJ49 too. This schematic was like idea in my head long time. Today I was checking my drawing skills. ;)

Quote:

The Pos & Neg monobolc idea also passed through my mind, I wonder if they would sound different (mirror image..)
I wonder too.

Regards

Anorgan 29th August 2003 05:51 PM

Splitting mosfets
 
Hi, I was just thinking, could you make a Zen v4 with a bunch of mosfets to "split" heat - is there a schematic for such things. I think it's called cascading, but I'm not sure. It could save some money on the heatsinks. THX for reply.

Nelson Pass 29th August 2003 06:09 PM

You can parallel quite a few Mosfets, giving each its own
Gate and Source resistor, and this can get you to much higher
power simply.

JOE DIRTŪ 29th August 2003 06:18 PM

Nelson what would you say is a safe approach to a parallel approach of the fets...I have done the math on the drivers but dont want to intrude on your design.....if you have this info on your site I retract the question but I am simply asking for the question at hand ;)

DIRTŪ


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