Module is a 1U tile.
Module is available as a DIY project only.
No info about availability.
Tube overdrive using NOS 6111 subminiature tubes.
Likely a one-off project.
Someone was curious as to whether or not this was possible...
"It is, but is rough and loses a lot of output."
Consumes about 400mA from +12V. The tube and the filament regulator get very hot in operation.