[R-390] re; R211

[Bill Hawkins]

Well, you could simulate the circuit with SPICE if you had all of the
hardware and software and knowledge required, or you could bridge the
82K resistor with a 10K resistor and see what happened.

Wait - a 1952 A model? Must have been early in the A generation, no?
Maybe things changed.

I'd give a better answer if I had the manuals at hand, but I've been
thinning the collection to avoid the dumpster.

Bill Hawkins


-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of wli
Sent: Saturday, November 07, 2009 5:51 PM
To: R-390 at mailman.qth.net
Subject: [R-390] re; R211

I am in the process of going through the RF deck on my 1952 Collins R390A.
The first thing that struck me was the chassis darkening in the
subcompartment under HR202. As we know the heater is *on* all the time,
cooking the Xtals. All the small components there showed the effects of lots
heat with runny wax on the micas and darkened ceramic disc bypasses.

One strange finding was R211. There was a 82K resistor, but all the manuals
called for a 8.2K resistor. My question is: is this just an innocent error?

Thanks

W. Li