If you change the cathode (by making it fatter) you would have to change g1 too, so you have a new valve not a 'trioded' EL34.
The EL34 is a pentode. The 6CA7 is a rough equivalent beam tetrode.
The EL34 is a pentode. The 6CA7 is a rough equivalent beam tetrode.
"I vote for a huge directly heated planar frame grid tube."
Maybe a grid made from graphene film draped over a frame.
There are these 3D printers now that make just about anything from ink jetted adhesive powder sprayed on layer by layer. Some glass powder, some nickel powder, some barium powder. Cad program on the PC. Finished "print" gets dropped into a kiln to sinter the powders together. Final unit gets evacuated and sealed. Will need some quartz powder likely to withstand the temp for sintering the metals. I think that's how "Vycor" quartzware is made already.
Maybe a grid made from graphene film draped over a frame.
There are these 3D printers now that make just about anything from ink jetted adhesive powder sprayed on layer by layer. Some glass powder, some nickel powder, some barium powder. Cad program on the PC. Finished "print" gets dropped into a kiln to sinter the powders together. Final unit gets evacuated and sealed. Will need some quartz powder likely to withstand the temp for sintering the metals. I think that's how "Vycor" quartzware is made already.
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There are other power triodes, although linearity was probably not uppermost in their designers' minds as most were intended for Class C transmitters. I thought the OP was interested in EL34-like triodes.
If you want to build a good regulator, linearity in the tube is not a bad idea.
Luxman made an amplifier in the 1970s that used a triode-modified tube. If I recall right, the tube was an EL34 with the screen removed.
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