[Amps] multi-tube amplifiers

[Mike McCarthy, W1NR]

I am considering building a dual 4CX1500B amplifier for a nice clean 1500W 
of AB2 output.  Since one tube is only rated for 1100W output in AB2, the 
need for two to reach full "leagal" limit.  Since I already have the 
components available, other tubes are not being considered.  The discusion 
of the Harris 110 amp brought this back to mind.

Someday I would also like to build a 2x 4-1000, mostly for looks.  I have 
enough components for that project also, including a filament transformer 
designed for a 2 tube setup.

But, I feel that 3 or more tubes pushes the complication factor past the 
benefit.  One of my elmers way back in the 70's built an HF amp using 4x 
4CX250's.  But he had a large box full of tubes and sockets to choose from. 
It was a handfull to keep running correctly and never really worked well on 
10M.

If I could afford the power lighting the filaments of a 4CX10000, I'd love a 
class A amp using one of those!

Mike, W1NR