Transformers do not have an "impedance" per se. They reflect the impedance of the device connected to the opposite side, depending upon the turns ratio. You're correct that an SUT with a voltage gain of 13 (i.e., a 1:13 turns ratio) would give an impedance of 278 ohms to a cartridge on the primary side, if loaded at 47K ohms on the secondary side. But it's not a "fault" of the Hana, if the Allnic has that rather oddball turns ratio of 13. Most typically, SUTs come in ratios of 1:10, 1:20, etc. You could easily cure the problem, if it really is any problem, by installing a load resistor on the secondary side that is higher in value than 47K. For the cartridge to see 400 ohms, the load resistor on the secondary would have to be about 68K ohms.
