NC-400 filters?

Floyd Sense sentek at SPRINTMAIL.COM
Tue Apr 6 21:35:16 EDT 1999

Does anyone know which mechanical filters were available as options in the National NC-400 ?  Since the receiver was made around 1959, I'm assuming they used Collins J series from the 75A4.  Does anyone know for sure?  

Floyd Sense in Angier, NC
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