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Old 22nd October 2009, 04:11 PM   #1
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Join Date: Nov 2004
Location: Southwest
Default What Pass designs have you built?

Just as the title states, list the Pass designs that you've built and what loudspeaker you are using with them.

Additionally, what I think this forum really needs is some kind of step-by-step process to help folks successfully build, and test these amps. Also, it would include a good list of hardware suppliers (ie. chassis, ps, surface mounts, ect.) in a sticky. I'll be happy to help with this process in any way that I can.

I've been quietly reading as many post as I can to do my first build (Aleph J) and I've done projects like this before, but it's a bit daunting for the first-timer. What I really see is a lot of folks talking about what they've done, but only through reading many, many post do you understand what needs to be done in each area (i.e. board stuffing, rectifier cap choice, ect.)


Airline Pilot-If it's not Boeing I'm not going.
"Brain as big as a planet..." {sic} Nelson Pass
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Old 22nd October 2009, 04:37 PM   #2
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Join Date: Jan 2004
Location: Irondale, AL
Built:First Watt B1
F5 (in Progress)
El Pipe-O's (8" versions)
Speakers: MCM Nearfield Monitors( from early mid 80's)
Been there, Heard that, Forgot what I was listening to!
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Old 22nd October 2009, 09:12 PM   #3
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Join Date: Jan 2008
Location: Salt Lake Silly, Yewtaw
A pair of Aleph 2's were my first DIY project. Then... Mini-A, Aleph 3 for a friend, Aleph 30(Peter Daniels board), Aleph L line stage. Also test built and verified a number of Aleph boards for Brian GT. I still have them all here!

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Old 22nd October 2009, 09:25 PM   #4
toufu is offline toufu  United States
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Join Date: Jun 2008
Location: San Francisco
Aleph 30, F3 and F5 with my Zu Druids speakers.

Out of those, F5 is my favorite. I am using it without the current limiting circuit and the difference is not subtle.

I am building the Aleph J or F4 next. Anybody got any ideas on which way I should go?
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Old 22nd October 2009, 09:29 PM   #5
Magura is offline Magura  Denmark
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Location: Denmark, Viborg
Zen 1,2,3,4,6,7,9, Aleph2, AX100, BOSOZ(any variation you can think of), BOZ, plus a mix of the above

Everything is possible....to do the impossible just takes a little while longer.
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Old 22nd October 2009, 09:35 PM   #6
slam is offline slam  United States
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Join Date: Jan 2005
Location: CA
Built: F5, B1

Speakers: McIntosh XRT-22

F5 was my first amp construction project. Nelson and Cviller's document was very helpful.

Last edited by slam; 22nd October 2009 at 09:55 PM.
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Old 22nd October 2009, 10:09 PM   #7
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Join Date: Oct 2003
Zen - 4amps/50V - blew it up
Aleph 5, 3 - various voltages and bias settings - blew them all up
Mini-Aleph - blew it up - twice
F5 - burned up when set to 3amps/35V
Currently listening to 25W SOZ, HOT!!! - eventually will blow up, driving FE127E's in planet10-hifi's Classic Golden-Ratio (GR) Fonken cabs
Built AlephJ - yet to be fired up, high biased/water-cooled - hopefully it won't blow up

Last edited by MEGA_amp; 22nd October 2009 at 10:16 PM.
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Old 22nd October 2009, 11:28 PM   #8
Beftus is offline Beftus  Netherlands
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Join Date: Nov 2008
Location: Netherlands
Built: mini Aleph

Work in progress: F5 (amp PCB's finished)

Soon to start building: B1 (waiting for PCB)

Will hopefully one day have a biamped system using: B1, mini Aleph and F5
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Old 22nd October 2009, 11:40 PM   #9
Join Date: Oct 2005
Location: Central Florida
So far, A5, F5, A30, 2 AJs, P1.7, Boz.

Spkrs,Seas Thors(cabs rebuilt once, x-ovrs three times), Zaph SR-71s, Wide baffle three ways similar to the Poor Man's Strads
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Old 22nd October 2009, 11:52 PM   #10
gl is offline gl  United States
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Join Date: Dec 2003
Location: Sierra Foothills - California
In order:

Stasis 2
UGS based line amp (not Cheffs)
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