Although no bolts or screws were obviously loose apparently there were enough
that were marginally tightened to cause the transformer hum. I tightened
everything around the transformer (including over tightening and breaking a
bolt that mounts transformer to chassis) and the hum is gone.
Thanks to all that replied.
73,
- Aubrey N3BM
On Sep 30, 2012, at 9:00 PM, Ron Youvan <ka4inm@gmail.com> wrote:
> Hi Aubrey N3BM:
>
> <<
> My 5 week old AL-80B has developed a loud transformer hum when keyed. It's
> very noticeable (and annoying), even with headphones on. Is this normal?
> >>
>
> It is not normal, but it is most likely a minor thing.
> Tighten any and all mounting bolts on, to or near the transformer.
> The magnetic field of the transformer can go out at least two inches, so any
> ferrous thing that is loose can vibrate and cause audible noise. GL es 73
> --
> 73 Ron KA4INM - All E-mail sent to this address shall linger in the Google
> cloud forever!
>
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