[Boatanchors] Transformer Question

[Bill Stewart]

Keith, if the xfmr has bell housing bolts, you might try tightening, 
loosening or adjusting them for least hum. Bry's suggestion should
help a good bit. If using the grommets isolates the xfmr electrically
from the chassis, you might need to run a jumper from it to gnd..just 
for safety...GL, 73, Bill K4JYS

----- Original Message -----
From: "Keith Densmore" <ve3gem at gmail.com>
To: boatanchors at mailman.qth.net
Sent: Wednesday, October 16, 2013 9:54:22 AM
Subject: [Boatanchors] Transformer Question

Hi Group,
A question about transformer hum.
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?

Thanks, 73,
Keith, ve3ts 

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