[R-390] The R-390A Mechanical Fillter ‘killer’ cap C553

[Larry H]

Hi all,  I just updated my document (R-390 Newbie Support Info) on our
website with a new paragraph at the end called:  Replace the R-390A
Mechanical Filter ‘killer’ cap C553.  This is something that all folks new
to the R-390A should know.  Here's a link to the document: R390 Newbie
Support Info <https://www.r-390a.net/R390%20Newbie%20Support%20Info.pdf>

Regards, Larry