Tom - WØEAJ
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While not as easy to do with DRAKE stuff, I used to run SWAN stuff (still
have a 350 & 500C I listen to), and the best method for preserving those
sweep-tube finals was to UNBALANCE the Carrier Balance control, thereby
injecting a very small amount of carrier - peak the grid - dip the plates,
then REZERO the carrier-balance. Worked swell, and the 500C that I got in
1972 still had the ORIGINAL finals in 1982, when I replaced the rig... and
yes - they were still good after many, many hours of use. [ the SWANS
required balanced tubes - they REALLY did - and they weren't cheap ]
