[R-390] Re: Follow-up on "Washing Your R-390 390A"

Craig Anderson Ext 1365 Craig.Anderson at saintpaul.edu
Mon Mar 20 13:22:54 EST 2006


An inexpensive and effective cleaning solution that I have found is to
use the commercial version of Simple Green called "Crystal Simple
Green".  Crystal Simple Green is non-fragrant as opposed to the home
version which has a strong pine smell.  It comes in 1 gal.  containers
and is priced at about $16/ gal.  at any Grainger outlet under their
part number 3UP40.  I use this in my heated ultrasonic cleaning tank for
the individual modules as well as stand-alone with a soft brush and
power washer when I am doing the R-390A frame.  I always do a double or
triple rinse with distilled water (de-ionized water is the preferred
method for the individual modules if you can get it).  I use an air
compressor after the final rinse to blow out the trapped water, then a
powerful hand hair dryer and then I place it in a box that I built
containing 60-watt light bulbs, a small exhaust fan and a thermostat to
maintain a temperature of 110 F - 120 F for 24 hours.  The box is large
enough to accommodate all of the R-390A modules plus frame at one time.
I have one set of bulbs on all of the time and the other set is
controlled by the thermostat to maintain the proper target of 115 F.
The small muffin fan runs all of the time to exhaust any humidity.

 

I also do a lot of restoration work on old broadcast sets like Zenith,
RCA, GE, Crosley and what a difference it makes after a good heated
ultrasonic tank cleaning.  I now do this prior to restoration!  It is
pleasure to begin a restoration with a clean chassis and clean
components. Unfortunately my ultrasonic tank costs about $2,000 so it I
probably not something everyone will rush out to buy unless you use it
often as I do.

 

Craig,

W9CLA

 



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