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Old 13th Sep 2017, 1:44 pm   #3
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
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Default Re: RCA 45X11 valve description.

Frequency-changers were often described as "1st Detector", not just by the Yanks. I recall this term being used in the 1930s Admiralty wireless-telegraphy handbook too.
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