Very good work Rob!? Great to save another one.
I suspect that resistor was in the mixer cathode as you suspected.
I think that rig might have been used with an external transverter where they just wanted the signal, the TR switching was done in the transverter.? Or not...?
Does it also have the other normal transverter mods (screen voltage RCA jacks)?
73,
Gary
WB6OGD
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Gary WB6OGD