John I'm not a technician but i'll suggest to check what's wrong ( "common" tube stuff such as power supply caps, rotary switches and tube sockets cleaning etc etc ) before any mod .
I've just repaired mine ( it was a tube fault, nothing serious ) and it work like a charm. I don't have any mod and i don't want to. I'm keeping every "vintage" stuff on its original "shape". The reason is : if I have an R-4C with modifications....isn't a R-4C anymore...if i want a solid-statd rig i have plenty to play with...but that's me . Check if any cap has leakage, try to swamp tubes with spares and good luck ! '73 de Adrian iz3svi ----- Messaggio Originale ----- Da: "John Boyle" A: Cc: Inviato:Thu, 13 Feb 2014 20:33:35 -0500 Oggetto:[Drakelist] R-4C Sherwood mods I just acquired an R-4C, s/n 23xxx, in excellent condition. It has the 3 CW filters and the 6kc AM filter, but no other changes. It works well but has an S7 background noise that is not present on my Ten Tec Corsair II. I'm planning on installing several of the Sherwood mods, but not all ot once. What mods would produce the most improvement and in what order should they be incorporated? I can do the work myself. I have the original owners manual with the schematic #11017421000. Thanks for your help. John Boyle, VE3PMA
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