Great ideaA 5mm pipe plumbing accesory might serve as a mounting for this tube at the edge of a circuit board ,either at the anode or the f2 connection .
Alternatively a flourescent tube clip could be made to fit the k,f1 connection ,
Incidentally, either of these clips in their various sizes make handy mountings for radial electrolytic caps too , it means your scaffold no longer has to bear the weight of the components , 6s17k-v is good to 500 G after all !
It is possible the hard part is probably max grid leak value5mm fuseclips at either end would probably be a neater way of socket mounting the 6s17k ,
I did see some of the planar valves on ebay , at a couple of dollars each there defiantely worth a look for audio .
I was trying to figure out if a self biased cathode follower with a directly connected fillament was possible , raised heater reference voltage to ground ,can the cathode resistor itself be the ground reference for the filament supply?
I'll add a sketch tomorrow for clarity .