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The schematic shows the multiple diode junctions of the selenium...a modern diode is just one junction with a single arrow. The "band" of the rectifier is where the positive DC comes out and this connects to the filter caps. The other end is the anode which connects to the AC input.
If all caps are new I would check and make sure they are connected right, especially the negative sides of the caps.
If the buzz is loud with the volume all the way down it is likely a power supply problem or less likely, heater to cathode leakage in a tube. If the buzz can be eliminated with turning down the volume the problem is elsewhere.
Caution as the power line connects directly to the chassis.
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