[Boatanchors] Transformer Question

[Drew P.]

Keith Densmore wrote:<ve3gem at gmail.com>

"I have a HP 23 supply which has a slight hum coming from the power
transformer. Not objectionable if mounted on the floor but I have it installed in a
custom metal enclosure and I do not like the extra noise.

Is there a cure for this? Or is a slight hum a normal aging effect on these
older units?"

Transformers will hum more loudly at increased line voltage.  If your voltage is much above 110V, a bucking transformer or Variac to reduce the voltage may be of help.

Drew