Avo valve tester rotary switches

[Dave Simpson]

Jesus Bushbaby, you've just stepped into some rocking-horse manure !  I'm assuming you mean the 9 section thumbwheel switch assembly ?  If so, an NOS one could be worth nigh-on £200. Mind you, it would make an ideal basis for the valve holder panel for your proposed homebrew valve tester project. I actually use the complete valve holder panel, including the thumbwheel switch assembly, from a duff AVO VCM Mk1, in the DC valve tester I built a few years back. 

                                                          Regards,   Dave