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Audis and vacuum tubes

>>They are well made, affordable, and still provide excellent service.

You neglected to add that both engage their owners with costly and
occasionally difficult to find maintenance parts and that many technicians
find them intimidating when compared to more commonly available models.

'61 HP 103B
'68 TEK 451 hybrid
'61 TEK all-tube mainframe
'7-something Heath VTVM
:-) :-) :-)