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Old 3rd December 2014, 11:47 PM   #1
LesFaul is offline LesFaul  Croatia
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Default Need advice which clone to build

Hi there guys! I have been planing to build Pass amp for a long time and finally got allmost all the parts I need to build one. Heatsinks (30 lbs to be exact), PSU caps (8 x 150.000uF/35V), all transistors (20 pcs IRFP240, 10 pcs IRF9610, etc) and all other small parts (resistors, capacitors, zeners, etc) and the last thing - 1000VA, C-core, 20 lbs transformer. But... It is rated at 2 X 14V AC only. I assume that after rectification and caps I can get something between 17 and 18V DC max. Any advice or idea which Pass clone to build to get most out of parts I have is more than welcome!
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Old 3rd December 2014, 11:55 PM   #2
Einric is offline Einric  United States
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Maybe and Aleph Mini on the +-17V.
With a 1000VA transformer you may be able to build a voltage multiplier since you have plenty of current capability........
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Old 3rd December 2014, 11:59 PM   #3
LesFaul is offline LesFaul  Croatia
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Aleph M is obvious choice but in that case all other components I have will be overkill for that particular amp...
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Old 4th December 2014, 01:47 AM   #4
flg is offline flg  United States
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Aleph-X
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Old 4th December 2014, 06:54 AM   #5
LesFaul is offline LesFaul  Croatia
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Aleph-X sounds like a good idea but isn't +/-17-18V DC a bit low? Has anybody around here built it that way?
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Old 4th December 2014, 09:59 AM   #6
zkri is offline zkri  Croatia
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You can use a voltage doubler and build Aleph 5.
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Old 4th December 2014, 11:08 AM   #7
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Quote:
Originally Posted by LesFaul View Post
Aleph-X sounds like a good idea but isn't +/-17-18V DC a bit low? Has anybody around here built it that way?
Actually, Grey's original design ran on +/- 15V rails.

Cheers,
Dennis
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Old 4th December 2014, 12:03 PM   #8
flg is offline flg  United States
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Did anyone say F5X -- the EUVL Approach
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Old 4th December 2014, 06:45 PM   #9
6L6 is offline 6L6  United States
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Voltage doubler and then F5Tv2
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Old 4th December 2014, 07:18 PM   #10
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I would try the Aleph-X but not with the IRFP240s. You need an older FET (044, 140, 150). Even though mine never satisfied me, others have had success with it. Remember, this design is over 10 years old so with the latest cap multipliers, differential chokes and better testing/matching equipment more accessible, this could the best Pass project. With that trafo you could run 0.1R source resistors on a classic (2 pair) Aleph-X and drive Wilson Watt Puppies or even a dead short if you wanted to

Last edited by nania; 4th December 2014 at 07:25 PM.
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