LA3A Input Impedance 150 Ohms?!

What is the input impedance of an LA3A?

According to Cinemag, the B11178 is equivalent to their CM-2511 which is a 1:5/10 mic input transformer with 600R/150R:150K impedance. But the circuit loads the secondary with 39K which means the impedance on the primary is going to be more like 39K/150K*600 = 156 ohms. Actually with attenuation at it's maximum it could dip to as low as 108 ohms.

This can't be right. What am I missing?

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Ok, so it's 600R/150R:15K which means with a 39K load the impedance on the primary will look like 39K/15K*600 = 1.56K. That makes much more sense. Thx.