I sent an email asking about that. Will update.
This is interesting. They make a 5 lead version with the windings connected in series internally for 1:10 ratio (plus a shield ground), for $20 cheaper ($75). Looks like they'll do a custom ratio on the same platform for about the same price:
This 5 lead option also makes it much easier to generate custom variations. The A10 is historically significant, but it’s also a great mic input xfo package. It’s large size and hum bucking construction would produce great results as a 1:2, 1:8, or 1 to almost anything. FYI - most custom variations will cost about the same as the base CT-A10L