For that approach, you'll need a higher voltage TX. The higher voltage will also raise the minimum current requirement( so-called 'critical current' ) to achieve choke-input regulation. You might also want to add another stage of filtering to get rid of the last volt or two of ripple. That's a nice little side-efect of the active load: high PS isolation and high zero-signal current w/o resorting to low value plate loads and high B+.
Applying Ohm's law, getting a 100V drop at 10 mA is only going to allow a 10k plate load. This will create some audible, but perhaps not detrimental effects.
regards.
Douglas
...to the soldering bench Batman!
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