Wiring this as SUT

[pjanda1]

I've got four Raunland Mic input trannies I'd like to try as SUT's. I don't know anything about them, but I figure it is worth a shot. There is no diagram on the units, but I have them in an amp, so I drew out a schematic. I don't have a way to scan it. So, here is what I found:

XLR pin 1 --- tranny pin 1 ---- amp ground
XLR pin 2 --- switch
Switch pos. “high” = grid of 12AX7 via .47uf cap
Switch pos. “low” = XLR pin 2 to pin 3 of tranny and tranny pin 7 to grid of 12AX7 (via cap)
XLR pin 3 to tranny pin 5

Tranny pin 4 connected to tranny pin 1 via .47uf cap
Also connected to grid of 12AX7 via a resistor
Tranny pin 6 is tied to 4 via a resistor and a weird jack marked “RC”

SUT wiring guesses:
Pin 1 = - input and output
Pin 3 = input +
Pin 7 = output +
But what do I do with 5, tie it to 3? And is 4 tied to the ouput -?

Any help would be appreciated. Otherwise I'm going to wire it up somehow and hope nothing breaks.

pj

[pjanda1]

Pic:

[pjanda1]

Hopefully you can see it, but the XLR pin 1 is the big black wire, pin 3 is yellow, and pin 2 runs straight down to the center near terminal on the switch.

pj

[pjanda1]

Revised Guess (I plan to try later if nobody sets me straight):

Pin 1 Ground (from TT)
Pin 3 + in
Pin 5 - out
Pin 4 - out tied to Pin 1
Pin 7 + out

pj