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IIRC on these sets, they don't actually use a resistor based divider to get B+ from B++...How it works is they actually use the tube stages as a divider (take a tube stage filter it's rails and you can model it as a resistive load to the PS). Some stages are across B++ and B+ some are across B+ and B- (those together form a divider to create B+ form B++) and others that need more voltage are across B++ and B-.
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