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I read that you had the diodes in backwards at first. If C1 and/or C2A are getting warm I would change out the diodes just in case one was damaged with the high current draw from being backwards. I would start over with fresh caps and diodes. I would also check the field coil on the speaker for any short to ground or low resistance. I don't think the sams had an ohm reading for it maybe the original one does. If it has a partial short to itself it won't filter the B+ correctly and cause "hum bars" in the picture. How is the sound? if you can't get much volume out of it that could be a sign of a bad field coil.
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