07-21-2022, 11:27 PM
The OP is referring to the suppressor grids of the RF and IF tubes in his original post, not the control grids.
fenbach, the schematic below shows the circuitry as you have described it.
https://philcoradio.com/library/download...20251A.pdf
(Yes, this site has Philco schematics as well, and they are completely free with no limitations.)
You have a later version of the 37-630, Code 126. The earlier version, Code 122, does have somewhat different circuitry as well as a different band switch with more "throw" between the three positions.
https://philcoradio.com/library/download...%20251.pdf
fenbach, the schematic below shows the circuitry as you have described it.
https://philcoradio.com/library/download...20251A.pdf
(Yes, this site has Philco schematics as well, and they are completely free with no limitations.)
You have a later version of the 37-630, Code 126. The earlier version, Code 122, does have somewhat different circuitry as well as a different band switch with more "throw" between the three positions.
https://philcoradio.com/library/download...%20251.pdf
--
Ron Ramirez
Ferdinand IN
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