Pass Labs XA25 convert 120Vac to 240Vac input

[masterbearbear]

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

 

[Attila I]

just watch out for the right phase, the two primaries must not nulling themselves!
cheers
A.

 

[Attila I]

and yes, double voltage -> half the fuse

 

[masterbearbear]

Attila I

please advise how to check the right phase of the coils

 

[Zen Mod]

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)

 

[Zen Mod]

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 🙂

 

[masterbearbear]

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

 

[chrisng]

I understand that the fuse have to reduce by 50%.
what else I need to do?

Soft start?

 

[Zen Mod]

I believe , by experience , that existing Gargantuan NTC will serve for 220Vac too , without changing anything