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Pass. p1.p preamplifer china help
Pass. p1.p preamplifer china help
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Old 13th May 2019, 09:46 AM   #1
neno70 is offline neno70
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Default Pass. p1.p preamplifer china help

Hi, I bought a pcb made in China x Pass Aleph p1.7 complete with relay volume control on Ebay. Now, from the template provided, you don't understand some components well, can you help me? thank you (5551 ??) ( 431 ?? )
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Old 13th May 2019, 10:36 AM   #2
ColinA123 is offline ColinA123  United Kingdom
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These tend to be unauthorised copies of Nelson Pass designs

Often with mistakes and if supplied with components fake and low spec items.


You may try to get support from the seller but that is often minimal.
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Old 13th May 2019, 11:06 AM   #3
neno70 is offline neno70
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I have the bare pcb affixed to use quality components ... and the psu scheme and preamplification and likely ... the problems I encounter are only in the recognition of the component indicated as 5551 and 431 that deal with the control of the relay volume. . xi 5551 I find only correspondences with 2n5551 but the pinout seems to me wrong. x 431 I can't find any matches .. thanks
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Old 13th May 2019, 11:14 AM   #4
neno70 is offline neno70
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maybe and tl 431???
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Old 13th May 2019, 11:19 AM   #5
Boydk is offline Boydk  Denmark
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No reason to keep posting. You won´t get help on this forum for fake Pass products.:
As Colin said earlier... "Contact the seller".
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Old 13th May 2019, 11:51 AM   #6
neno70 is offline neno70
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thanks
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Old 13th May 2019, 04:57 PM   #7
Nelson Pass is offline Nelson Pass  United States
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Pass. p1.p preamplifer china help
It may help you, maybe not.

Attached is the service manual to the AlephP1.7
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Old 13th May 2019, 05:20 PM   #8
neno70 is offline neno70
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Quote:
Originally Posted by Nelson Pass View Post
It may help you, maybe not.

Attached is the service manual to the AlephP1.7
thanks thanks thanks ms. Pass..
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Old 14th May 2019, 02:52 PM   #9
WBS is offline WBS  United States
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Pass. p1.p preamplifer china help
That's the kind of person he is.
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"Why do we try to fool the ear? Because it makes people happy and it makes it easier to listen to stuff."
Nelson Pass, BAF 2012
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Old 14th May 2019, 07:04 PM   #10
Danger Mouse is offline Danger Mouse  Germany
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Quote:
Originally Posted by neno70 View Post
I have the bare pcb affixed to use quality components ... and the psu scheme and preamplification and likely ... the problems I encounter are only in the recognition of the component indicated as 5551 and 431 that deal with the control of the relay volume. . xi 5551 I find only correspondences with 2n5551 but the pinout seems to me wrong. x 431 I can't find any matches .. thanks

If you dont get help from the supplier. A good Point to start is to make a circuit diagram from the pcb.
Only the volume Control part.
The chinese copycats will have cloned the preamp part 1:1 so there you could Need the Service Manual.

Maybe with a Diagram the parts you Looking for become clearer
This is what i would do.

Will be some work but...
...but better than nothing.
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