[R-390] More cleaning info

[Jim Whartenby]

PerryI am under the impression that the aluminum in the R-390, and many other military radios for that matter, is protected by a chromate conversion coating.  What does the polish or aggressive cleaning do to the original protective coating?Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Thursday, January 11, 2024 at 02:27:18 PM CST, Perry Sandeen via R-390 <r-390 at mailman.qth.net> wrote:  
 
 List here is an update on some of the cleaning materials mentioned in previous post.
The simple green cleaner Bill Riches uses:
Simple Green® ExtremePrecision Cleaner, 1gal., Clear (SMP13406) US $35.62/ea FreeShipping (Ebay). It's specifically made for aircraft cleaning.
Wenol red or blue is about $12 for 50 grams.
I've used Mothers Aluminum polish on my SP 600's.  Some times I add some Bon Ami ONLY cleanser as it is non-chlorinated and it doesn't scratch.  The Mothers polish will leave a bit of oily residue which is easily washed off with liquid dish soap.
If one is re-working a SP 600, replacing all the easily accessible screw with SS makes for a much nicer looking receiver. For small amounts Ace Hardware and/or True Value stock an enormous variety.  I use Phillips head screws as the are easier to tighten W/O slipping and scratching the chassis.
If one is planning to do several receivers, McMaster Carr online has every screw in boxes of every type that you will ever in your life. There delivery service is amazingly fast. 

73
Perry KM6FQV






______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html