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Old 17th October 2015, 08:16 AM   #1
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Default Which Pass clone did I really buy?

I came across a Pass Clone that was sold to me as an original Aleph. Looking at the amp board I'd say it must be some other version. The amp sounds very good (though one of the monos exhibits a slight hum).
My question: can aybody guess which amp was actually built here? I should add that the seller did not build those amps himself but bought them some years ago and I certainly do not think that he was trying to fool me.

[IMG]Click the image to open in full size.[/IMG]

[IMG]Click the image to open in full size.[/IMG]

Any help will be appreciated.
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Old 17th October 2015, 08:33 AM   #2
AndrewT is offline AndrewT  Scotland
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If you take the time to trace out the PCB and place on that the devices, you should be able to reverse engineer the sch.
Job Done.

The wiring is a mess. That needs sorting.
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Old 17th October 2015, 10:10 AM   #3
Zen Mod is offline Zen Mod  Serbia
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at least read what transistors are in and write here

looks as Aleph J , but having one TO92 extra ......
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Old 17th October 2015, 10:25 AM   #4
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I just checked - the transistors seem to be ST 0118 TIP147 - does that help? The wiring....well - most of it is actually solid core - so a bit ricky to redo.
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Old 17th October 2015, 10:46 AM   #5
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mystery partially solved

no Aleph - TIP147 are bipolars , while Aleph is having mosfets in output

unfortunately , no other way than to trace schm from pcb
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Old 17th October 2015, 11:41 AM   #6
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That is "unfortunate" - to put it mildly. Well, did Mr. Pass design any amp with such transistors?
I mean the amp(s) do sound good, but obviously they are not what they are supposed to be.
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Old 17th October 2015, 11:48 AM   #7
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Quote:
Originally Posted by dubai2000 View Post
..... Well, did Mr. Pass design any amp with such transistors?
.....
I believe he did (lazy to check older ones) but certainly not with just one pair in output

check on FW site - articles, and on passdiy.com

though , to avoid muddy crystal ball game , best way is to trace schematic and post it here

also , measure rail voltages
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Old 17th October 2015, 11:58 AM   #8
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I might have found something on the net. Somebody had posted about a Pass Labs a40 amp and the driver boards do seem to look similar....

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Old 17th October 2015, 12:01 PM   #9
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good call
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Old 17th October 2015, 12:26 PM   #10
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Quote:
Originally Posted by dubai2000 View Post
That is "unfortunate" - to put it mildly. Well, did Mr. Pass design any amp with such transistors?
I mean the amp(s) do sound good, but obviously they are not what they are supposed to be.
Don't be disappointed you have a nice chassis and power supply.
You could potentially get some F6 pcbs or Bablefish J pcbs and throw them in the chassis and "Bob's your uncle".
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