new x.5-series voltage issue

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N

nightscalper

Member
Joined 2006
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.

Regards
N.S.
 
Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
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.
 
N

nightscalper

Member
Joined 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 let´s say VERY honest with bad
recordings.

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.

Regards
N.S.
 
N

nightscalper

Member
Joined 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.

Regards
N.S.
 
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