In terms of gain, a 1:10 is probably preferable, in terms of load a 1:20, at least according to their specs for transformer loading. I’m not really sure why they specify different loads for transformer vs MC head amp, that’s just odd.
A 1:20 would probably give too much gain, so I’d be inclined to go with 1:10 and experiment with load resistors.
Cheers Mark. I’m still waiting for the cart to turn up and I have nothing to mount it on at the moment as switching out the IO is a pain due to having to keep tightening the tags for the smaller IO pins so it could be awhile but thanks.