I believe I've devined from the old ads that the National R-175 plate choke
was pre-15m and the R-175A was redesigned for post-15m bands.
The question is (if I've gotten my history right), how do you tell the
difference? I've got a basket case amp with one or the other, but either
the p/n has faded/rubbed off/whatever or they didn't mark their parts.
Any physical clues as to differentiating? Thanks!
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Scott Townley
nx7u@primenet.com
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Collector of:
Stoddard Aircraft EMI/RFI receivers and accessories
Big Parts for that Big Linear Amp
70's era RF test equipment HP/GR/Tek
Radio-related technical reference material 1940+
...anything else that will keep me off the streets at night
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