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RE: 10Y Filament bias circuit

Thanks! The circuit I am working on is a 10/10y/vt25 IT coupled to another 10/10Y/vt25. I am using a Hammond 126C. I have a 20volt DC @1.25 A supply for the filament. The heaters are connected in series (15V @ 1.25A) and bias for the input tube provided by a 4 ohm resistor in front of the filament supply. Bias for the second stage is provided by a negative voltage supply.
This is very similar to a circuit by Greenvalve Audio (Luddite 2 10).
The biggest problem I have encountered so far is trying to reconcile the values in the Greenvalve schematic with the RCA plate curves. Delighted to have found Ale's plate curves for this valve.

Regards

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