looks somewhat similar, with same basing but bit different ratings, heater(also looked in my GE Essential Characteristics)
Friends of the 6L6 - Some power tetrodes and pentodes
looks similar as well and as with the 6BQ5/EL84, apparently some (heater number)CW5 were beam tubes.
Audio EU Pentode2
sorry I don't know if it will be an adequate sub
Bookmarks