Re: Boonton RF Probes; Diode Replacement
Matching. I think they were matched for similar forward resistance (or current at some small voltage). The forward to back ratio is less important at those low voltages.
The GEX66 was often specificed as a high frequency mixer diode. It was made by GEC, which then became AEI (hence I suspect CG91H). Then GEC/AEI merged it's semiconductor business with Mullard, hence AAZ13.
All gold bonded germanium with very low capacitance, low stored charge so very fast and about 8v rating.
wme_bill
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