[Hallicrafters] SR-42A IFs and mixer crystal

[Roger Basford]

Hi,

I'm new to the list, having just acquired a SR-42A and HA-26 that I'm 
starting to restore. I've downloaded the manual for the SR-46A, which 
I'm told is very similar in design to the 42A.

I have a couple of questions, what are the IF frequencies of the 42A 
receiver ( 20.15 and 1.650 MHz as in the SR-46A)?  Is the 2nd mixer 
crystal the same as the 46A, (18.5 MHz)? The crystal is missing from my 
equipment and before I get one cut I need to be sure of the frequency.

TIA,
-- 
Roger Basford
(G3VKM)