Originally Posted by muchxs
Umm... it's a pentode if I remember correctly. Likes less voltage and a bigger cathode resistor than 6V6. 6W6 (same tube, 6v filament) will work for a few minutes as a 6V6 sub until it redplates.
Not as a sub should have been more clear, but at around 200v it is said to sound like a 6V6. The whole problem is finding suitable transformers.