echorec,
I think TK was suggesting that you look at the the 1073 schematic under the N*EVE info section of Dan Alexander's site. Yes, the numbers are hard to read but it does show how a 31267 was wired to a 1073 preamp/EQ module. The primaries are wired in series (connect 3 to 4, 5 = + in, 2 = - in). You can see also that the paralleled secondary windings (connect 7 to 8 for + out, connect 9 to 10 for - out) have a 2n2 (2200pF) film cap connected across as a zobel and are then loaded by a 2.2kohm resistor. This resistor is part of a stepped attenuator which the input signal is taken from via the wiper (pole) of the rotary switch. You can see that if we add up the other resistor values it is equivalent to putting that 2.2k resistor in parallel with a 1k resistor. Therefor, we can say the 31267 is loaded by approximately 690 ohms.
You could replace the switching network with a pot of this value or modify the input circuitry in a couple of ways based on your application needs and preferences. Generally there isn't a better way to do it than the original diagram specifies. The 2200pF capacitor is important for reducing excessive ringing of the transformer in response to a certain frequency. Fortunately you already have one. It's a mustard colored polypropylene film type, correct? I've been trying to find a good replacement for these, so if anyone knows of any?
For a better reproduction of the aforementioned schematic, go to http://www.technicalaudio.com/pdf/neve/ and click on 1073-EH10023.pdf
[EDIT] Just now I understood your connection question. As mentioned, pins 7 and 8 joined are the + output of the transformer. This gets connected to the unbalanced input (tip) of the EQ with the other side, pins 9+10, connected to COM/audio ground (sleeve). Don't forget that the 2n2 cap and network, pot, or equivalent resistor of ~690 ohms are in parallel with this connection.