Fisher k 10 Spacexpander - Reverb Transformer

[smilan]

I am restoring a Fisher K-10 reverb unit. I need a new reverb driver transformer. The driver tube is a 7247 & the tank is 4FB2B1C with 1475 ohms input impedance. Does anyone knows the primary & secondary values?
Here's the schemaitc:

Thanks

 

[smilan]

I've done some testings with a working K-10 transformer and while applied 1 Khz with voltage of 1V to the primary and measured 0.437V on the secondary.
So1 divided to 0.437 equal 2.288, this should be the loop ratio 2.288?
Now 2.288*2.288 = 5.236, this should be the impedance?
When multiply 5.236 with the input impedance of the reverb tank (1475) it's equal to 7723.
I've checked the plate resistance of the 7247 tube and it's 7200, so it should make sense.
So does this testings helping me to find the right transformer?

 

[Enzo]

I suspect a plain old Fender reverb transformer would work well. But that would want a 4AB pan rather than 4FB.