[R-390] Fwd: New list member here

[Don Reaves]

John, those 1N561 diodes were part of a Navy mod to solid state the power
supply.
See www.r-390a.net/*NAVSHIPS*-*0967-063-2110*-FC6-1966.pdf
I've run across a few of those myself, and they all had bent sockets to
prevent a tube from being plugged in.  But no goop.

Bent tube sockets weren't specified in the Navy mod; RTV was just salt in
the wound (pun intended).

Room Temperature Vulcanizing that contained acetic acid (smells like
vinegar) is most certainly corrosive over time.

Don


> I am now tearing into the power supply, which has the 1N561's.  The tube
> sockets have been pushed in and filled with what looks like an RTV.  I do
> not like the condition of the wiring - it looks like many connections had
> enamel wiring or tinned bus.  There is corrosion evident, enamel almost
> looks melted off, and the solder looks filthy.  There are some signs of
> crystallization on the aluminum bracket, too.  I have been wondering
> whether the acid that is present in an RTV cure was working some chemical
> reactions over time.  The teflon wiring looks pretty good, however, and the
> transformer has the appropriate voltages.  The diode cases are showing
> signs of rust, which is a first for me.  The module was made by Motorola.
>
>