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 Post subject: Knob Restoration
PostPosted: Jul Tue 23, 2019 1:52 pm 
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Joined: Nov Fri 17, 2017 2:52 am
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This is an Eric Engineering model 1157. It's rare and I have yet to find a picture of this model to verify the color of the original. I'm wondering if there is a way to restore the tuning knob. It looks like it's clear plastic with metallic silver or gold mirror paint underneath. I'm pretty sure I can remove the old coating and polish the plastic to clear again. How do I recreate the mirror finish?


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 Post subject: Re: Knob Restoration
PostPosted: Jul Tue 23, 2019 2:52 pm 
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Joined: Nov Thu 11, 2010 6:03 pm
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Location: Pewaukee, WI
Most knobs that look like that used a thin polished brass insert. Modern mirror/metal finished plastic uses vacuum deposition where the metal is vaporized in a vacuum at a certain distance from the plastic to be metalized.... that tech didn't exist in the 50s and was more expensive than punching out a bunch of rings of sheet brass.


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 Post subject: Re: Knob Restoration
PostPosted: Jul Tue 23, 2019 5:11 pm 
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Location: Norfolk, VA
Check with a magnet first - some are just steel inserts with a coloring toner applied. If so, polishing will make it shiny and silvery... :cry: DAMHIK.

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 Post subject: Re: Knob Restoration
PostPosted: Jul Tue 23, 2019 7:16 pm 
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Location: Pewaukee, WI
Findm-Keepm wrote:
Check with a magnet first - some are just steel inserts with a coloring toner applied. If so, polishing will make it shiny and silvery... :cry: DAMHIK.


Toner is still available so one could polish it off and reapply.....though it a whole can that can do much much more than a few knobs isn't exactly super cheap.

If it is lacquer try to chip off a piece and guage it's hue. You want the same hue with the same or less saturation and to lightly coat it repeatedly till it is dark enough.


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 Post subject: Re: Knob Restoration
PostPosted: Jul Wed 31, 2019 4:34 pm 
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Joined: Apr Sat 11, 2015 5:30 pm
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Location: West Point, PA 19486
Here's a post on how to remove the white crud from the knobs.
https://www.antiqueradios.com/forums/vi ... p?t=114454


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