[Amps] multi-tube amplifiers

[Colin Lamb]

I am familiar with solid state amplifiers using combiners - somewhat common.  Were there any commercial tube amplifiers using combiners?  Any precautions, notes or advice - beside using a lot of extra hardware?  But, if you have extra tubes, you might have extra variables and switches.  It would also be a way to avoid running tubes in parallel - something like keeping wives in separate houses but combining the fun.

Colin  K7FM

By the way Peter - was the 1960 Handbook the green one.  ARRL used some experimental glue on the binder that year and it started falling apart immediately.