Amps on top?

1)" The companies that mount their output tubes on vertically-orientated circuit boards..."

 2) "...but those tubes are not mounted on circuit boards inside an amp enclosure, where the heat would flow past circuit components. ""

       1) The boards on which the driver and output tube sockets reside, are vertically oriented, per your objection.

        2) boards: inside    tubes: outside  (the exception)

        Another, "cool looking" V8 amplifier, complete with engine stand:

                               https://youtu.be/6vdZVo8gFe0

                                    Four-stroke operation?

                                  GOTTA love the chrome!

@rodman99999: Love the chrome! EAR-Yoshino also builds their electronics with lots of chrome. Their 868L pre-amp and CD player have chrome faceplates, many of their power amps chrome transformer covers and tube cages. Fancy schmancy ;-) .

@bdp24 -

       Chrome was an option on my Cary monoblock chassis, but: I went the cheap route on 'em (black).       Both would show the dust anyway, so...     

        Keep trying to convince myself: I'm not lazy, just fuel-efficient.