[Amps] Cooliing 3-500Z in AL-80

[Ken Kaplan]

I have a simple question for you amp wizards.  I am refurbishing an old 
Ameritron AL-80 that has been hacked at a bit by former owner(s).   
 Should the cooling fan be mounted blowing in (across the tube) or 
exhausting out of the chassis?

Thanks and 73,

Ken NØGZ