Check out the COMPACTRON, a tube containing multiple "tubes" in a single glass envelope.
http://www.junkbox.com/electronics/CompactronTubesIndex.shtml
These tubes are big and chunky and were intended for TV use and wave soldering onto a PCB.
Then there is this vacuum tube ADC!
http://www.electricstuff.co.uk/glassadc.html
http://www.junkbox.com/electronics/CompactronTubesIndex.shtml
These tubes are big and chunky and were intended for TV use and wave soldering onto a PCB.
Then there is this vacuum tube ADC!
http://www.electricstuff.co.uk/glassadc.html