In Reply to: ARC - Bad circuit designs that eat tubes? posted by Willo on April 08, 2003 at 01:50:24:
there are some who criticize ARC for their horizontal mounting of output tubes. Never mind the fact that the Svetlana spec sheet states "Operating Position: Any".
This canard also applies to current VTL amps as well.
The Mullard Valve Standards volumes, the TungSol 14 volume tube data and design guide, the RCA radiotron designers handbook, the Audio Cyclopedia... need I go on... ALL recommend horizontal mounting of vacuum tunes. Get a clue. That may be why 95% of commercial amps (Altec 256C etc etc etc) mount horizontally.
My guess: all historic sources refer to tubes mounted in a safe enclosure, with limited ventilation, probably with a shielding can - but is it important for tubes mounted open on the upper deck?
Some time ago, Joe Rosen, a most colorful individual with a "unique" outlook on matters said this:
Again, only a RETARD mounts power tubes horizontally, if you want to reduce reliability in even the best NOS tubes by 90%, here's the best way to do it.
See the link for my reaction. :)
This post is made possible by the generous support of people like you and our sponsors: