[R-390] White lines on knobs

[Don Heywood]

Larry, your "A" model receiver looks very nice, you have been taking your 
time and doing a fine job.
Now, primer paint. I use a product from Sherwin Williams, it's a self 
etching automotive primer number 988. Works well on both front panels and 
knobs. On the knobs I use two coats with a light sanding in between coats, 
it fills in the mold marks on the knobs which aids in giving me a nice 
smooth top coat. I have used many brands of black, both semi-gloss, flat 
black and appliance epoxy. I have never had any wrinkles form. The 
semi-gloss gives me the most original looking knobs.
Regards,
Don WC4G

-----Original Message----- 
From: Larry H
Sent: Saturday, August 17, 2019 1:03 AM
To: R-390 Forum
Subject: Re: [R-390] White lines on knobs

Well, I finally got all of the knobs finished, except for one.  It's being
a pain getting the black on it without wrinkles.  Tried a couple different
metal primers to no avail, and they are supposed to be good for aluminum.
Any suggestions?

Here's a picture of my progress.

I'm now working on the BFO stability.  It currently is drifting down about
150 cycles in about 1.5 hours.  This is fairly common for one of this age,
but is not good for CW or SSB reception or some alignment procedures.  You
can see my counter probe attached to the BFO output at the front left.  I'm
going to try to get it down to less that 30 in .5 hour.

Happy fixing.  Regards, Larry

On Wed, Jul 31, 2019 at 1:46 AM Larry H <larry41gm at gmail.com> wrote:

> Thank you all again for providing info to me about white lining the
> knobs.  It sure made it easier for me this time.  I did the 6 that have 4
> coats of black on them and were cured long enough.  That sure made a huge
> difference.  I used an artist enamel that I already had on hand, Folk Art
> 4001 wicker white gloss acrylic.  It is water based, so has easy cleanup
> until dry.  I used it again because of the color match and it's durable
> when dry.  I applied it with a syringe I confiscated from a printer
> cartridge ink refilling kit.  A picture of the front panel of the Stewart
> Warner in progress is attached.  This time, I didn't even have the urge to
> throw a knob across the garage, like last time.  Thanks again.
>
> Regards, Larry
>






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