07-10-2016, 09:37 PM
The Rod tubes though are not space charge grids like 12K5, they don't actually have ANY grids in the conventional sense. It's only the 1j37b and 1j42 "misused" in Gammatron mode (g1a used as grid and g1b used as anode and the other electrodes earthed to f-) where "space charge" mode comes into it at all.
Or are you referring to ECH81/ECH83, etc and other valves used with 12V HT and usually 0V or slightly positive grids? It's not how the 1j42a achieves 6V HT
Or are you referring to ECH81/ECH83, etc and other valves used with 12V HT and usually 0V or slightly positive grids? It's not how the 1j42a achieves 6V HT
