One needs a high gm, low input capacitance device to act like a cathode follower. Some pentodes work quite well, but a pair of DN2540 mosfets rigged in cascode as in the Guinevere plate loads is even better. No set resistor is needed.

Have this device ride on a goooood CCS. Again the Guinevere plate loads will do well, and this time we *WILL* build the complete thing. Set it to sink 10 mA.

Attach the volum pot's wiper to the lower gate, and cap couple from its source( as in Guinevere ).

Supply a +/- 60V set of rails and we're off...low output Z, wideband response, and no silly high voltage capacitors needed.

For parts, a 120V CT power TX, two 10 Hy/100 mA chokes and two good capacitors are all that's required. Figure $100 max if you don't want a gold-plated box...
regards,
Douglas

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If you're sugesting a simple voltage divider pot, the pot and buffer I just laid out ought to run circles around it.

Since I have a feeling that there is substantial prejudice against SS stuff, I thought to show a way it could be used to good effect. Always use the best design to solve the problem. Sometimes it might just be a SS one. FWIW, I don't recall anybody complaining about the performance Guenivere delivered.
regards,
Douglas

The suggested PS of 60-0-60 would yeild ~50 volts at the L-C filters.

I have most of the parts, and need a proper sized box. I will probably try a remote PS and see how that experiment goes. I have a bunch of photo flash caps salvaged from disposable cameras which have done well in audio circuits to try( they're small 330VDC/160 uF ). It is interesting enough, being completely SS to try IMO.

There is a certain satisfaction to be gained in favourably comparing to something far more expensive and Off-the-Rack, no?
regards,
Douglas