[Premium-Rx] Dangerously off-topic, diversity again

[Ka9p at aol.com]

Wading into this diversity topic again, but on the theory that the general 
nature of the question may be universally applicable to those slaving better 
stuff here goes.

On a pair of R4b's, slaving the pre-mix oscillator without slaving the IF 
crystal oscillator or the 50 khz bfo has resulted in long term stability between 
the receivers of between near zero and about 20 hertz, which is fine for AM 
but sometimes a little 
much for SSB/cw.  I'm calculating this by counting audio beats, as I don't 
have a decent freq counter to acomplish this, or I'd answer my own questions 
that follow....

What I'm wondering is whether anyone familiar with this stuff has a good 
guess as to which (or both) 
of these oscillators is the major source of the drift, as I'd like to take a 
step wise approach to slaving them with as little alteration of the radios as 

possible.  I am aware the C line has a 50 khz output jack, which makes me 
suspect Drake knew the BFO drifted, and thatDrake color coded IF crystals 
according to their temperature coefficient, which makes me suspect that they knew 
that oscillator drifted as well (I have a "C" and a "R", another possible 
cause)

If anyone has any ideas on this, or the best way to slave those oscillators, 
I'd really appreciate hearing your thoughts.

Thanks, Scott