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You know direct rectification will yield a hot chassis....A better way to go is (assuming you are using a step down transformer as part of the filament supply) if the fill xformer is say a a reasonably stout 120V-6V transformer, then get a 120V-9V Stepdown transformer, and connect the 9V winding to the 6V....That will give you around 80Vac isolated on the 120V winding of the 9V step down xformer (being used to step up here).
You will get roughly 80*1.414=113V rectified which is easier to resistively divide down than 120V*1.414=170V...You could also use another LM317 to regulate the B+ and get it down to 90V from 113V.
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