|[AMRadio] looking for HRO tuning knob|
k4kyv at hotmail.com
Wed Jun 14 11:34:45 EDT 2006
If it's an early HRO with the German silver dial (not painted black), do not
destroy the dial. Replacements are almost impossible to find.
Also, never use emery cloth,sandpaper or other abrasive to clean those
dials. I always preferred a cloth lightly oiled with WD-40, and lots of
polishing using a soft cloth. Eventually the oxide will go away and some
shine can be restored. Abrasives will permanently ruin the surface.
I once bought one of those receivers thru the Yellow Sheets. The receiver
was in excellent condition, but the seller said that before shipping, the
dial was a little corroded, so he "polished it up for me." He had sanded
it with a fine grade emery cloth, and the dial calibration markings were
partially and permanently eroded away. Reminds me of the time when I was
about 7 years ago, and I got into my uncle's collection of Indian Head
pennies. I used sandpaper to shine some of them up to a bright copper
finish. No need to even mention his reaction.
National replaced the dial with the black painted version after the first
year or two of production because the German silver tends to tarnish to a
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