[Boatanchors] Tunable hum!

[Ken Hickman]

Hi Gang,

I am in need of info I have long forgotten! What are the causes of tunable
hum?
Way back when I was young and handsome! Hi! I used to know the common
problems with radios
but my recollection ain't what it used to be!
Your help will be greatly appreciated.
The HQ-129-X has been recapped with orange drops and "chocolate drops"
(that's what I call them).
I haven't checked any micas yet.
Thanks & take care,

Ken   N5CM