Is it possible to bridge a vintage 2 channel tube amp?

I have a 2 channel vintage tube amp (Leslie 251). One channel is 15 watts into 8 ohms and the other is 40 watts into 16 ohms. I want to bridge the two channels to get more power out of it. The schematic can be found at <>http://www.captain-foldback.com/Leslie_sub/leslie_schematics.htm>
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