Hey Isaacc7, the screen grid voltage on a Pentode configured FireBottle is regulated so the B+ stays the same regardless of which rectifier tube you use.
The plate voltage on the input tube is also regulated.
The B+ voltage changes on the plate of the output tubes when you change rectifier types.
The tube charts are in a notebook at the shop so I don't have access to them right now.
Can you post a picture of the tube chart you have?
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