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The 224 (and possibly others) have the ~300-350 ohm rheostat with switch for line adjust, just like the Hickoks. Most of the 224's I've seen lately are missing the line adjust - taken out to restore a Hickok somewhere along the way.
I've got the innards to a 224 - one socket, the meter and of course, the rheostat are all missing. Good transformer, though...
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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