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More digging reveals the S-56538 is the listed (in 12/1969) Zenith replacement for your S-53620. Triad D-327 replaces the S-56538. My Thordarson guide lists the Fly 274 as a replacement for the S-56538 as well....
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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