[R-390] Mechanical Filters

[Craig C. Heaton]

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of
Flowertime01 at wmconnect.com
Sent: Thursday, May 31, 2007 8:00 AM
To: r-390 at mailman.qth.net; densmore at idirect.com
Subject: Re: [R-390] Mechanical Filters


Keith,

The Fellows here on the R390 reflector did a whole series on rebuilding the
filters
here last year. You will need to look through the archives.

There were even web pictures and everything when we got done.

You can fix the filters if you can solder, We can help.

<snip>

Here is an URL to a website that will at least help disassemble the filter.
So far, I've had zero luck getting the coil winding apart. Can't dissolve
the stuff used as a potting material. The last thing I tried was MEK. Soaked
the coil for several hours; nada, zip, didn't faze it one bit.

http://collinsfilter.tripod.com/


But I did find the time to restore another R-390/A, an Amelco. Now
repainting the trim on my house. If someone really knows what dissolves the
potting material, I'd like to have the secret.

Thanks,
wd8kdg
Craig