[R-390] Chassis finish

[DW Holtman]

Hello,


Does anyone know if the yellow coating put on the aluminum parts 
(including the chassis) throughout the R-390A  is Alodine? I was under 
the impression that Alodine was not tough enough for an exterior coating 
on a chassis, that will be subjected to rough handling.

Another question. Was the modification that installed variable caps 
(C-569 through C-571) in the input and output of the mechanical filters 
in the If module applied at Depot during rebuilds, or just put on newly 
manufactured modules?  The reason I'm asking, there is an IF amp for 
sale on Ebay without the variable caps on the IF Module. It went through 
depot 1982, and does not have the variable caps. This particular module 
looks like it has yellow plastic caps? Ebay item number is 5847326968. 
I'm just courious about this mod, because I have two IF modules, one 
with and one without the mods. Thank you in advance for any help.

Happy New Year to all.

73's
DW Holtman
WB7SSN