[R-390] Knob finish

[Bob kb8tq]

Hi

If they *are* aluminum (and not zinc or …) then they may be anodized. 

Bob

> On Mar 30, 2019, at 7:37 AM, fdigio1 at gmail.com wrote:
> 
> Hi everyone,
> 
> my project of restoring my R-390A goes on.
> 
> Now I am dealing with the front panel knobs. Many of these are scratched, 
> 
> so I decided to strip away the old paint and redo the varnish.
> 
> It's been a surprise to me. The paint of some knobs  treated with paint
> stripper,
> 
> go away without effort.
> 
> 
> 
> With the others, it is very difficult to remove the old paint.
> 
> These knobs have some light differences from the others. 
> 
> They have 3 light "dimples on their base
> 
> (the side facing the front panel).
> 
> After several hands of paint remover, the original paint is still there.
> 
> Where the black paint is not present, the surface of the bare aluminum is
> light yellowish,
> 
> similar  as the surface of the rx's mainframe.
> 
> The varnish of the "three dimples knobs" is extremely resistant and durable.
> 
> Aside the difficulties to remove the paint, I wander what kind of finish the
> knobs have?
> 
> What magnificent piece of equipment the R-390 and R-390A are!!!
> 
> 
> 
> Regards
> 
> Francesco Di Giovanni - IN3XZP
> 
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