110 to 220volt conversion?

Metric · 28th March 2010, 05:03 PM

Anybody got schematics on converting a Pass Labs X250 from 110 to 220 volts?
What do you have to do? Is it a big deal?

Per Øyvind
NORWAY

event horizon · 28th March 2010, 05:19 PM

It shouldn't be a big deal - no

I should imagine that the mains transformer used has two 110V primaries wired in parallel for 110V use. To convert it to 220V you'll need to connect both primaries in series (start to finish, they need to be in phase to work properly). A change of mains fuse to approximately half the current rating of the fuse used at 110V would be handy for safety reasons.

Don't take this as gospel though as i'm not at all sure if there are other circuits that are powered from the mains side rather that transformer secondary.

Nelson Pass · 29th March 2010, 05:26 PM

The X250 was shipped with dual primaries, and so it can be
re-tapped to 240V, and possibly to 220V. Because of the
potential for shock and/or fire, the change should be done by
a qualified technician.

More specific information can be obtained from PL.

Metric · 30th March 2010, 05:32 PM

Thank you very much!

Best regards,
Per Øyvind
NORWAY

28th March 2010, 05:03 PM	#1
Metric diyAudio Member Join Date: Mar 2005 Location: Raufoss	110 to 220volt conversion? Anybody got schematics on converting a Pass Labs X250 from 110 to 220 volts? What do you have to do? Is it a big deal? Per Øyvind NORWAY __________________ Pass Labs x600, x1, ML Odyssey, Marantz SA-11S1, Syneristic Research cables

28th March 2010, 05:19 PM	#2
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	It shouldn't be a big deal - no I should imagine that the mains transformer used has two 110V primaries wired in parallel for 110V use. To convert it to 220V you'll need to connect both primaries in series (start to finish, they need to be in phase to work properly). A change of mains fuse to approximately half the current rating of the fuse used at 110V would be handy for safety reasons. Don't take this as gospel though as i'm not at all sure if there are other circuits that are powered from the mains side rather that transformer secondary. __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

30th March 2010, 05:32 PM	#4
Metric diyAudio Member Join Date: Mar 2005 Location: Raufoss	Thank you very much! Best regards, Per Øyvind NORWAY __________________ Pass Labs x600, x1, ML Odyssey, Marantz SA-11S1, Syneristic Research cables

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29th March 2010, 05:26 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	The X250 was shipped with dual primaries, and so it can be re-tapped to 240V, and possibly to 220V. Because of the potential for shock and/or fire, the change should be done by a qualified technician. More specific information can be obtained from PL.

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