Well well well... I'm so ecstatic. I thought I couldn't be any more than this, but I am.
As anticipated here
, yesterday at the lab we went back to what we know of the original specifications of the Schaffer Vega. It clearly stated - thank God - that the input impedance of the transmitter
was 50kohm (basically, right after the input jack there is a resistance inside the transmitter box).
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Original Schaffer Vega Specifications (transmitter/receiver)