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Old 14th January 2011, 04:55 PM   #511
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Location: Bakersfield Ca
I have been thinking of upgrading the caps to Simlic II if I do I will shoot some inside shots. I used an unusual method of clamping the output fets so I could change boards conveniently. It is a little under sized on heatsink but I like em hot. If I ever finish the control section of the pumpkin I will put the Impass up for sale.

Bill
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Old 14th January 2011, 11:37 PM   #512
FAA is offline FAA
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Hi Guys

I just completed F5 for a friend of mine.. I'm using Fairchild for outputs and without the thermistor.. it takes about 30mins for the bias to fully set..

Nuvotem 225VA and 4 x 27000uf/25V caps per channel.. DC offset is about 1-2mv.

Thanks NP..

regards from the Philippines.
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Last edited by FAA; 14th January 2011 at 11:41 PM.
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Old 15th January 2011, 12:41 AM   #513
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Quote:
Originally Posted by wirewiggler View Post
Here is my Balanced F4, I drive a pair of them with a Pumpkin and Impasse the Pumpkin is faster the Impasse is laid back. I have been holding on to a set of SIC JFETS waiting to build J2 clone if it ever comes out, and would like a build a B4 and a pair of OB. Since Mr Pass seems to be holding those designs close to his chest I have had to resort to brewing beer. The wife is much more prettier and the sound system sounds pretty good.
You guys are building some nice stuff on this page.

You will want the B5 for that OB, and there will be a
diy description of the filters, so you will be able to roll your
own.

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Old 15th January 2011, 04:41 AM   #514
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Quote:
Originally Posted by regiregi22 View Post
So you confirm that it is, in fact, just an economy issue.
Not only.
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Old 15th January 2011, 04:43 AM   #515
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Quote:
a diy description of the filters
Wow!
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Old 15th January 2011, 11:43 AM   #516
AuroraB is online now AuroraB  Norway
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Location: Norway, -north of the moral circle..
Wiggler-Bill...

That's a mighty fine lookin' amp..!!
Been thinkin' of doing something "woody" myself...I'm tired of black or nature alu boxes....I see them all day at work......
Just gotta sell that blasted second house first.....
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While the Lie leapt from Bagdad to Constantinopel, the Truth was still looking for it's sandals!
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Old 15th January 2011, 09:54 PM   #517
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Smile My PASS Aleph 5

Hi everybody,

here is my Aleph 5. Thanks to Nelson for the great sound of this good old circuit!

Thomas

gesamt_mit_kommentaren_klein.jpg

vorne_klein.jpg

hinten_klein.jpg

MOSFETS_klein.jpg
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Old 16th January 2011, 03:20 PM   #518
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"You will want the B5 for that OB, and there will be a
diy description of the filters, so you will be able to roll your
own."

Sweet !Yes I am B challenged, I was holding on to a set of f5 boards for the bottom end. Mr Pass was playing with some OB designs was anything published?

Bill
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Old 16th January 2011, 04:50 PM   #519
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Quote:
Smile My PASS Aleph 5
Hi everybody,

here is my Aleph 5. Thanks to Nelson for the great sound of this good old circuit!

Thomas
Very nice!

Aren't those heatsinks intended for air forced kooling?
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Old 16th January 2011, 09:33 PM   #520
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Originally Posted by bobodioulasso View Post
Very nice!

Aren't those heatsinks intended for air forced kooling?

Yes, you are right. It was not possible to get the convection cooling type anywhere in Germany. The thermal performance is still acceptable (and it is easier to grasp the amplifier at both sides when you want to lift it )
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