Quote:
Originally Posted by PJL
The early coke bottle KT66 (VT75) have a similar anode structure to the 6L6G but, as others suggest, the 6L6GC characteristics are likely to be different so you need to check the cathode current and adjust the auto-bias to set to the same as the KT66.
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Many thanks for all the replies.
Taking measurements with both 6L6GC and KT66 and adjusting, if necessary, is a sensible route.
There are well documented performance figures for the Quad 22, so I can check a unit with 6L6GC against these as well.
The various variants of the 6L6(GC-WGB...etc.), 5881 and 7581A are a bit of a can of worms.
Regards
Terry.