BeoMaster 5000 voltage conversion to 120v

[Gene Ku]

Greetings,

Looking for help:  Wanting to convert a 220v BeoMaster 5000 to 120v. I found the wiring schematic but it doesn’t say what type thermal protection (maybe R40) nor how to mount it. Maybe someone has one or has done this? Also, curious if a fan might be better (saw a post about that).

Thoughts?

Thanks for your reply.

Gene

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[Dillen]

R40 is the NTC resistor for the over-temp protection circuit in the amplifier section.
It has nothing to do with the wiring of the mains transformer.

The mains transformers shown on page 8-4 for 100V and 120V are different from the one used for 110/130/220/240V.

Seeing as you have a Beomaster currently set for 220V:
If you have 110V in your mains, I would convert to that.
If you have 120V mains I would convert to 130V.
If you absolutely must convert to 120V you must replace the transformer with a correct one (8013299, that has a thermal fuse built-in).

You must also replace the mains fuse with one of twice the amp rating. (Half voltage – twice current – same power, also known as Ohms law).

Martin

[Gene Ku]

Many thanks, Martin!

I have 110v but have seen it go to 115v which is why I was thinking 120v–probably too much thinking and not worth changing the transformer.

Thanks for the reminder about the fuse!

Regards,

Gene

[Dillen]

I wouldn’t worry as long as we are within +/-10%.
I don’t think the power plants can guarantee a tighter tolerance anyways.

Martin

[Gene Ku]

Thanks again!

[Author]

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