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The 3A3 and 3A2s are the high voltage rectifiers. They wouldn't have any effect on the distorted sound.
The 6505 is a gas high voltage regulator. It also wouldn't have anything to to with the sound. You won't find a replacement for the 6505 - it was made just for that set and I've never seen one outside of a chassis.
Your problem is almost certainly not a tube. It may be one of the selenium rectifiers, or some other part in the power supply.
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