dynamic mutual conductance tube tester with supplemental charts. rca
and ge tube manuals included. EXC Condx. works well.
similar instrument went on ebay last month for $600 + shipping
our price...$500 includes shipping in cont 48 ---708-681-4845
days 0900-1800 cdst. pix available upon request.
this one is a keeper if you need a tube tester.
BTW its for testing tubes (aka valves) you know!!!