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RE: What makes transformers buzz? Does line conditioning help?

Posted by tubular.well (D) on April 23, 2016 at 14:40:17

In Reply to: What makes transformers buzz? Does line conditioning help? posted by mbnx01 on April 23, 2016 at 11:17:50:

A few reasons for mechanical noice from power transformers :

Loose windings might cause hum, can be cured by impregnating ( usually vacuum-impregnating).

Loose bobine, same think but might also be glued with "shellack" dipping

"dirty power" ( the ideal sinus-waveform altered, possibly by phase-swithed thyristor driven stuff.)

To high mains voltage, causing the core to partial saturation.

DC in the core, caused by semi-working rectifiers

Bad mounts / thin chassies, this was the case on original dynaco MkIII, the transformers causes the chassies to vibrate violently when using 50hz

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