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Aleph P MK II
Aleph P MK II
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Old 20th March 2018, 04:29 PM   #1
Seths is offline Seths  Germany
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Default Aleph P MK II

Hi people who can tell me how I can detect an aleph P mk2

Greeting
seths
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Old 20th March 2018, 04:41 PM   #2
Zen Mod is offline Zen Mod  Serbia
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Aleph P MK II
try harder ...... explaining what you want to achieve

if needed , I believe some of your Countrymen will help with English
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Old 20th March 2018, 09:09 PM   #3
Danger Mouse is offline Danger Mouse  Germany
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MK2
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Old 20th March 2018, 10:10 PM   #4
Dennis Hui is offline Dennis Hui  Canada
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Aleph P MK II
If you contact Pass Labs with a serial number, they may be able to tell you the
revision.
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Old 21st March 2018, 09:07 AM   #5
Seths is offline Seths  Germany
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[ATTACH]46D62F58-918A-48C6-99C5-8EB1409A7024.jpeg[/ATTACH]
Quote:
Originally Posted by Danger Mouse View Post
MK2
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Old 21st March 2018, 09:19 AM   #6
Seths is offline Seths  Germany
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Default MK II ????

Also nach dieser Beschreibung wäre es ein Rev 1.7


Nach Meinem Foto wäre es aber auch ein MK II

Hat jemand noch tips?
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Old 21st March 2018, 12:16 PM   #7
coolnose is offline coolnose  Europe
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Hello,

apparently you already own this piece of equipment. I would contact PL with the serial number as stated above.

ECHO ON
GERMAN

"Hallo,

es scheint Du besitzt den Vorverstärker schon, ich würde einfach mal PL mit der Seriennummer kontaktieren wie bereits vorgeschlagen.

ECHO OFF

Regards / Gruß

Max
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Old 21st March 2018, 01:24 PM   #8
Pars is offline Pars  United States
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Default Aleph P MK II

I used to own one (wish I still did). My understanding is the original version used TO-3 cased IRF output devices (1 N, 1 P) per channel. The 2nd version went to TO-220 devices (double the quantity) and added the remote.
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Old 21st March 2018, 03:05 PM   #9
Danger Mouse is offline Danger Mouse  Germany
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I think it is nothing to be worry about.


It is a Rev1.7.


Rev 1.0 look more like in the attached Picture.




In the Service Manual are 2 Mainboards shown. Maybe MK1 & MK2
They differ in some Resistors, diodes and a cap.
Probably the difference is marginal.
The Preamp part of the PCB look mostly equal.
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Old 21st March 2018, 03:18 PM   #10
woofertester is offline woofertester  United States
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Quote:
Originally Posted by Danger Mouse View Post
I think it is nothing to be worry about.


It is a Rev1.7.


Rev 1.0 look more like in the attached Picture.




In the Service Manual are 2 Mainboards shown. Maybe MK1 & MK2
They differ in some Resistors, diodes and a cap.
Probably the difference is marginal.
The Preamp part of the PCB look mostly equal.
Very interesting picture. The TO3 IRF244 parts are all marked 3.70. I assume that this is a matched quad that all have exactly Vgs = 3.70 at their operating current in the preamp. They may also have the same transconductance at that Vgs.

I suspect that producing matched quads requires a large population of devices to choose from.
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