I'm also confused about the e-caps. The schematic symbol for the capacitors looks something like this: -[ - and I'm having a hard time not only figuring out the polarity, but figuring out which e-cap goes where. I disconnected the original can, but it didn't provide a color code like my Philco did so I'm not sure I have the right caps in the right place. e-cap #26 (not one of the three in the can) which is a 50 mfd running between the output tube and the rectifier had been replaced by two 20's wired together to make a 40 mfd. I followed the polarity when I put in the new 50, but I'm still not sure it's correct since this radio was modified quite a bit over the years. The schematic can be found here:
http://www.nostalgiaair.org/PagesByM...8/M0016688.pdf
One of the (canned) e-caps goes to the on/off switch, one goes to a terminal, and one goes to the output tube. I'm assuming the black wire running to the rectifier is the common ground, but I'm learning not to assume anything. I'm reading up so I can better read schematics, but it's hard when some of the symbols are out of date.
Thanks,
Dan