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Old 7th June 2006, 10:23 PM   #1
diyAudio Member
Join Date: Jun 2006
Default new x.5-series voltage issue

Hello to all, hello Mr. Pass,

on Audiogon I found a used X 250.5 and a used X 350.5
Pass Labs power amplifier offered by a dealer. The devices
were operated at 110 VAC 60 Hz.

Today I run a Pass X 250, might want to upgrade to .5 but
would need to operate them at 220/230 VAC 50 Hz.
My complete system works at that voltage.

I read in some earlier posts here (I think even one was
from Mr. Pass) that you must only change some jumper
settings and a fuse to operate them with different voltage,
but I think to remember, that this answer was related to
the earlier X250.0 model.

Is this still valid fo the newer X.5 series ?
Could someone please help me with this question ?
Thanks in advance for your time.

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Old 8th June 2006, 12:05 AM   #2
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
In general you can re-tap the primaries, as they have
dual primary coils, however currently X600.5 and X1000.5
amplifiers have dedicated voltage transformers, and would
require transformer replacement. At any given time it would
be wise to check with the factory.
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Old 8th June 2006, 01:55 AM   #3
diyAudio Member
Join Date: Jun 2006
Alternatively I would appreciate any hints how you could
retrofit the improved HF/RF filtering of the newer .5 X-series
to my "older" X250.

- which parts ?
- can I order them from Mr. Pass ?
- how to install them properly ?

I ask this, because my system sometimes sounds
a little to harsh or letīs say VERY honest with bad

Many thanks in advance for ANY hint related
to reducing "honesty" to make a Pass X1/X250 combo
a little more foregivable.

Many thanks ain advance.

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Old 8th June 2006, 01:55 AM   #4
diyAudio Member
Join Date: Jun 2006
Dear Nelson,

thanks for your superfast reply.

Could I contact someone of the factory via email,
who would provide me with the particular part of
the circuit diagram, so I could safely re-tab the
primaries of the transformer to the right 220/230 VAC
coils ? Or is this unmistakable, because there is only
one coil for each + and - left, to which I would have to
re-tab the primaries ?

Thanks again.

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Old 8th June 2006, 06:46 PM   #5
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
You can email me with the request.
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