[R-390] 390 oscill. oven removal

[Dan Merz]

Hi, I better correct something I mentioned about removing the oven over the
1st/2nd oscillator crystals in the 390.  I think I saw what I wanted to see
and ignored the facts.  The oven is not held on by any screws or the
standoff posts once the chassis is removed from the radio.  The oven can be
slipped off by just sliding it off and is held by the friction of some thin
flat spring shims under the oven edge. The four stand-off posts that butt
against  the radio sidewall stay with the oven when it's removed and don't
hold it on,  as I mistakenly reported.  It was quite snug  and I was so sure
that it was held by these posts that I didn't notice that the studs went
right along with the oven when I removed it !!!  Later when I "secured" it
back on and then noticed it was loose when I was working on the circuitry,
I realized that the posts had nothing to do with securing it out of the
radio.  When installed in the radio the phenolic posts do keep the oven from
moving.  One more example of how preconceived ideas have a life of their
own,  at least in my case,  Dan.