You need to follow the CRSP matrix for Zenith Modules - see this thread for some images of the CRSP manual - last image has the 9-121 info.
http://www.videokarma.org/showthread.php?t=247024
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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