[R-390] new member, R390A, no signal when first powered on, works after 10min but RF cutting in and out

[Tisha Hayes]

It is possible that you have several problems going on at the same time.
Popping noises can also be something like a bypass cap that is
intermittently shorting out and kicking the B+ in the pants.

Usually I do not suspect something mechanical like a bad connector unless I
am manipulating the radio mechanically (tapping, twisting, pushing, etc..)
on parts of the radio that can make that intermittent electro-mechanical
problem appear or disappear. If you go chasing after the unlikely then you
are going to get frustrated and start ignoring or bypassing major portions
of what should be a methodical approach to troubleshooting.

I have had radios that I could hear the soft rush of static through the
speaker, then I would hear a "POP" and the static disappears and over the
next second or so the audio comes back to to the static sounds.. Then
3-5-10-20 seconds later another POP and the same disappearing and fade
returns.
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-- 
Ms. Tisha Hayes. AA4HA

*""In this denial of the right to participate in government, not merely the
degradation of woman and the perpetuation of a great injustice happens, but
the maiming and repudiation of one-half of the moral and intellectual power
of the government of the world." -- Fredrick Douglass"*