Yig info needed YIG-Tek 173


I have a Yig-Tek filter, seems to be new, but I cannot find any info on it, or even a Yig-tek catalog.
Does any one have any info on a Model 173 ? It has sma in and out, and has 4 bottom connections, marked +/-, but nothing further. presumably one pair is the heater, and one for tuning but I am not sure what is reasonable for applied voltage and current. any help appreciated! off list is best, at the address below.

all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.

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