[Boatanchors] Transformer Question

[Bry Carling]

Keith,

When I was about 13 or 14 years old eyebolt and 8 W tube amplifier by mail order.

It had a mechanical hum coming  from the power transformer.

I sent it back to them for repair. When it was returned to me I found that they had put rubber grommets on the mounting bolts of the transformer. It didn't correct the problem completely but it did improve it somewhat.

Bry Carling
http://af4k.com

> On Oct 16, 2013, at 9:54 AM, "Keith Densmore" <ve3gem at gmail.com> wrote:
> 
> 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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