Filtering a power supply 220VAC to 110VAC

[j.frad]

Hi there!
A friend of mine has bought an X81 from vintech and the power supply that comes with it (110Vac input)
The problem is that the vibration from the 220-110 transformer creates a hum that we can't get rig of, we've tried several transformers but it doesn't help.
I've sent an email to vintech about rewiring the internal transformers in the psu to 220V but I don't know yet if it is possible and I don't know if it will actually solve the problem since they were built for 60Hz Mains.

I'm not yet considering replacing the transformers (even though i might be the simplest solution).
I haven't yet had the opportunity to try with a european 24V supply (the Lab supply I've got here only goes to 15V)

I don't really know where this problem could be coming from. I know GSSL users in 60Hz countries have issues that can be solved usin expat audio's CRC, i guess it could be tweaked for the frequency that is causing me problems and added into the priginal PSU.

Anyway, any help od advice would be greatly appreciated! Thanks a lot guys
Jules

 

[mitsos]

Vintech doesn't have a switchable 110/220 PSU?  Maybe it's internally switchable? I would pop it open and look for multiple (4 instead of 2) primary wires (the side hooked up to mains). Most trafos are built for 50/60Hz so you should be OK in that aspect.

While you're at it, though, I'm curious what kind of audio trafos are in your vintech? I heard talk that some units have old st ives, and some use other trafos (possibly chinese?).

 

[j.frad]

Hi!
I'm still waiting on vintech's answer, the transformers seem to have multiple primaries so it could be easily solved.
Input transformers are under a metal case so I can't really know which they are but the output transformers are recent for sure.

 

[GoldsteinStudio]

Hey J.frad

Did you get an answer in the last 9 years ?