Quite complete info on the Tek 575/175 is here:
including 1963 catalogue pages, the Op/Serv manuals and the 'Some
Transistor Measurements Using the Type 575' app note I'm about halfway
thru re-doing.
There were two versions: one with 0 to 20/200V Peak Voltage Range and the mod 122C with 0 to 20/200/400V capability.
You might also want to dig up the three recent and quite good
iterations of vacuum tube testers as they interface with a PC. They are
the uTracer:
the eTracer:
and the much more ambitious, capable, costly and, I'm told, difficult to
build RoeTest:
Best,
Bill Perkins
Liam Perkins