[Collins] Collins 75A4 misc wants

[John Hensley]

Looking for one of the Collins 4:1 reduction gearbox for the A series receiver.  Will consider both knob and gear box but the gear box is the fat lady singing.  Please QSL if available via private email.On a related note: does anyone keep a technical folder on the 75A4 ?  I'm interested in learning what manual rev date goes with approx. what serial number series.  I'm not referring to the Compendium publication by ER which copies past articles.  I'm referring to user charts, references, substitution lists, etc. which don't really comprise an article but are handy to have themselves.TIA,John W5JV
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