Any harm in using an amp with the face down

just to get off topic a bit further - as for tube mounting, it depends. Big high-heat tubes (845 for example) only can be mounted vertically. It spec's this in the tube manuals - the RCA manual is a good resource if there's any question. Other lower power tubes - sure, sometimes they are mounted horizontally/etc. There can be heat issues doing this though - sometimes dissipation is not as efficient. Preamp tubes - mount however, they dont' generate all that much heat. more heat = less life, when it comes to tubes. (within certain limits of course).

YMMV,
-Ed

Depending on amp specific you're dealing with there can be convection cooling interference that might lead to decreased cooling / higher working temperatures. Also consider that resonance / vibration issues are affected by say footers and placing the piece as mentioned might render a different sound presentation. Another $.02

Thanks for all the usefull input. I'm gunna run with it.. Take care. E974