Thanks for finding that, Al. Unfortunately I could not open the link but I found an alternative crossover image here, including one which foregoes the autoformer entirely:
https://www.hilberink.nl/codehans/tannoy36.htm
I don't have a lot of experience with the use of autoformers in speaker crossovers, as for the most part they predate me, but as far as I can see this is an impedance compensating resistor. It keeps the impedance of the transformer stable as the switch changes.
In this case, it looks like Elizabeth was correct, and the absolute value there is less important than elsewhere, but it's value will probably affect the absolute location of the high pass filter.
Best,
E
https://www.hilberink.nl/codehans/tannoy36.htm
I don't have a lot of experience with the use of autoformers in speaker crossovers, as for the most part they predate me, but as far as I can see this is an impedance compensating resistor. It keeps the impedance of the transformer stable as the switch changes.
In this case, it looks like Elizabeth was correct, and the absolute value there is less important than elsewhere, but it's value will probably affect the absolute location of the high pass filter.
Best,
E