I think "Thunder Grey" was a Larsen-made one?
Trigger voltages weren't a problem till the Nikon F3 came out IIRC. We had a customer who paid a premium to get the "Firstest, latest & greatest" & fried it the first day!
The 611 is high at 180 DCv, but I have a couple of "Wein Safesynchs" attached to the 611 sensors & the GX8R ringlflash which use the old 180DCV trigger voltage.
The 285HV (with its "safe" low voltage trigger) is actually the big problem!
The "peanut" slaves, & the old HV optical ones were parasitic, they took power from the sync circuit. That was the problem with the "New, Safe" 285HV. They went too far! The 180v wasn't just reduced to 8 DCV, But even lower to 4.5 DCv. Because of that they didn't trigger because of the low input voltage!
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