[R-390] Resistors for the R-390A and beginner help

[Tom Warren]

Bob,

Makes perfect sense.  Now that I see where you're going, I'll take a serious
look at a bunch of the circuits there and see if I can find any holes in
your analysis.  I suspect there are no holes.

I've been following the other compulsive types on this net (Nolan, where are
you??) who replace the resistors if they're out of their reputed tolerance
band.  My Motorola IF deck had about 15 resistors out of spec (along with
two dead mech filters, two IF cans with stuck slugs, and the usual capacitor
replacements).  My pristine EAC'67 is in much better shape, having replaced
fewer than a half dozen resistors plus all the usual caps.

I'm glad you brought up this point about the design brilliance of the
Collins boys in that drifting resistors don't bother the performance as much
as I would have thought.

I'll look up MIL-HDBK-217 also.  I think it's still around somewhere.

Many thanks,
Tom, W4PG

----- Original Message -----
From: "Bob Camp" <ham@cq.nu>
To: "Tom Warren" <wwarren1@nc.rr.com>; <r-390@mailman.qth.net>
Sent: Tuesday, January 14, 2003 8:43 PM
Subject: Re: [R-390] Resistors for the R-390A and beginner help
>
> There the *theory* on the resistors:
>