The IF amps and associated DBMs were 50 ohm not 500 ohms.?
The TIA amp is 50 ohms and the DBM is also 50 ohms.
The actual network is L network and the calculation is simple.
Note C250 and 216 are not there (zero value means not installed.).
Also c211 and C251 are large enough to be near zero reactance at 45mhz
and serve as DC blocking.
So the active network is L7 and C212 and the mirror components on the other side.
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Allison
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Please use the forum, offline and private will go to bit bucket.
