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Pass Labs XA25 convert 120Vac to 240Vac   input
Pass Labs XA25 convert 120Vac to 240Vac   input
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Old 9th July 2018, 06:17 AM   #1
masterbearbear is offline masterbearbear
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Default Pass Labs XA25 convert 120Vac to 240Vac input

Hi

I have a Pass Labs XA25 with 120Vac input. Recently, I moved city when electric power is operated at 240Vac.

I want to convert the amplifier input to 240Vac.
By reading others previous post, I learned that the 120Vac input, 2 sets of 0-120V Primary wiring are connected in parallel.
I think it may able to change to 240Vac input by connecting the 2 sets of 0-120V Primary wiring in series. as shown in may attached photo


Can anybody help to resolve my question?
I understand that the fuse have to reduce by 50%.
what else I need to do?


Thanks in advance
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Old 9th July 2018, 09:20 AM   #2
Attila I is offline Attila I  Germany
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just watch out for the right phase, the two primaries must not nulling themselves!
cheers
A.
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Old 9th July 2018, 09:24 AM   #3
Attila I is offline Attila I  Germany
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and yes, double voltage -> half the fuse
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Old 9th July 2018, 10:27 AM   #4
masterbearbear is offline masterbearbear
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Attila I

please advise how to check the right phase of the coils
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Old 9th July 2018, 11:44 AM   #5
Zen Mod is offline Zen Mod  Serbia
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Pass Labs XA25 convert 120Vac to 240Vac   input
STOP RIGHT NOW whatever you do !

send an email to boyz at PL , and you'll be served properly

(if Papa or Wayne don't chime in here , already)
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Old 9th July 2018, 12:25 PM   #6
Zen Mod is offline Zen Mod  Serbia
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Pass Labs XA25 convert 120Vac to 240Vac   input
OK , here is what to do , knowing what you're doing:

see attached pic ; for starters - let's call wires and pads with there 4 letters

desolder B wire , desolder C wire ; mark them , to know which wire was where

then check are they of same secondary - continuity (buzzer) check on your DMM

then :

- if they are in continuity ( same secondary ) , wire A to A pad , D wire to M pad , B wire to M pad , C wire to C pad
-if they aren't in continuity , A wire to A pad , C wire to M pad , B wire to M pad , D wire to D pad

let somebody else check my (noon ) sanity ...... just now working on my (very late) first coffee
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File Type: jpg phasing.JPG (133.2 KB, 117 views)
File Type: jpg WP_20180709_14_26_23_Pro.jpg (85.0 KB, 114 views)
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Last edited by Zen Mod; 9th July 2018 at 12:39 PM. Reason: added second pic
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Old 9th July 2018, 12:44 PM   #7
masterbearbear is offline masterbearbear
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Quote:
Originally Posted by Zen Mod View Post
OK , here is what to do , knowing what you're doing:

see attached pic ; for starters - let's call wires and pads with there 4 letters

desolder B wire , desolder C wire ; mark them , to know which wire was where

then check are they of same secondary - continuity (buzzer) check on your DMM

then :

- if they are in continuity ( same secondary ) , wire A to A pad , D wire to M pad , B wire to M pad , C wire to C pad
-if they aren't in continuity , A wire to A pad , C wire to M pad , B wire to M pad , D wire to D pad

let somebody else check my (noon ) sanity ...... just now working on my (very late) first coffee
Thanks - I will try
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Old 9th July 2018, 02:42 PM   #8
chrisng is online now chrisng  United States
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Quote:
I understand that the fuse have to reduce by 50%.
what else I need to do?
Soft start?
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Old 9th July 2018, 02:53 PM   #9
Zen Mod is offline Zen Mod  Serbia
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Pass Labs XA25 convert 120Vac to 240Vac   input
I believe , by experience , that existing Gargantuan NTC will serve for 220Vac too , without changing anything
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