John,
The Henry 2K Classic X I have here runs a pair of 3-500's and has a squirrel
cage blower pressurizing the lower cabinet with outlet up and through the tube
sockets and associated glass chimneys. I have not seen any problem with
cooling the tubes in this particular amplifier. The fan is a bit noisy though.
More importantly the filament voltage was on the high side of specification,
so a large rheostat was purchased and fitted to the primary of the filament
transformer to bring the filament voltage to the lower end and hence increase
tube life.
Good luck
Gene Bigham
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