Avo Valve Tester

[pamphonica]

Sorry if I have missed something in this thread, but I am sure that this tester is missing a vital bit. You MUST have the standard Avo panel with the thumbwheel switches in order to test valves. This "add-on" valve base panel is then plugged into that panel. In the absence of that panel with thumbwheels you will need to do an awful lot of cross-patching of pins to get any sensible results.
Sorry if this is covered earlier but I have only had time to skim this thread.
Jeremy