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Beomaster 3000-2 mod 2402 Mechanical hum

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Ninni
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Ninni posted on Sat, Jul 18 2020 6:12 PM

There is a hum from my Beomaster. It's there even if I turn the speakers off, so it's mechanical vibrations from the mains transformer. It's not very loud but it's noticeable between songs.

Is there enything that can be done to reduce the hum?

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Dillen
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Answered (Verified) Dillen replied on Sat, Jul 18 2020 7:58 PM
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It's a production problem in some transformer series.
The only cure is to replace the transformer with one that doesn't hum.

Martin

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Dillen
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Answered (Verified) Dillen replied on Sat, Jul 18 2020 7:58 PM
Verified by Ninni

It's a production problem in some transformer series.
The only cure is to replace the transformer with one that doesn't hum.

Martin

Ninni
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Ninni replied on Sat, Jul 18 2020 9:14 PM

Thanks Martin. I have another 3000-2. I'll check if that hums.

Ninni
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Ninni replied on Sun, Jul 19 2020 7:54 PM

I powered up my other BM 3000-2. It didn't hum. So I guess it's transformer transplantation time.

Ninni
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Ninni replied on Tue, Jul 21 2020 4:11 PM

The transformer is now replaced with the one from the donor unit. No hum anymore. With the old transformer, there was a sound like moving cardboard boxes for a couple of seconds after startup. This also disappeared. With the "new" transformer, the voltage to the power amplifier is a couple of volts higher.

I get the impression that the sound is slightly clearer and more punchy but that could be my imagination.

It was quite a bit of work to replace the transformer but it was well worth the effort.

jegy
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jegy replied on Sat, Aug 8 2020 3:51 PM

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