Double-check that pic against an RCA datasheet. 35W4 heaters are pins 2/7 (6 as CT to cathode), plate 5, cathode 1. Your 3/4 for heaters is a common mixup with other tubes. Schematics don't lie.

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I posted a pic of the specification sheet from General Electric. My pin out is correct.

Hello? You never answered me. I replied here.