Here's a schematic and socket voltage chart I scanned:
http://www.bobandersen.com/images/schematics/ge/802/
Does adjusting the height control (R49) have any effect ? There are 3 electrolytics (C27B, C27C & C27D) around V19 and V20. I'd double check the polarity on the replacements you put in. Also try swapping V20 with another 6V6 like V8.