[R-390] re; R211

[Cecil Acuff]

Naa.. it's the PTO heater we turn off to keep from further shrinking 
important stuff in there...it's not needed.

I think most are still running the crystal Osc. heaters though...

Cecil
----- Original Message ----- 
From: <22hornet at gmail.com>
To: <R-390 at mailman.qth.net>
Sent: Saturday, November 07, 2009 6:28 PM
Subject: Re: [R-390] re; R211


>I always though in order to prevent frying the crystal you have to turn the
> heater off. That was one of the first things I learned when I got my R390A
>
> On Nov 7, 2009 5:21pm, Bill Hawkins <bill at iaxs.net> wrote:
>> 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
>
>
>
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