Quote:
Originally Posted by G6Tanuki
Higher HT generally gives greater linearity. I recall somewhere seeing a 1950s US design for a triode-strapped grounded-grid 807 linear, the big thing about GG operation is that it does away with the need for separate screen-supplies and neutralisation.
Some of the old US TV "Sweep Tubes" were essentially 807-derivatives, and these were popular for use in linear-amps.
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There appear to be a number of examples on the net of this sort of thing. A 6L6 is electrically similar to the 807 except for the top cap. Other great valves would be the 6BG6 sweep tube as you say. See attached for 6L6 2MHz circuit, does require a moderately high drive voltage/power as I think David was alluding to.