Got a Teletester model t-56, looking for any info I can get, Anyone seen one or every used one?
Are you sure its a T? I think their 456 was the most common model they made. It differed from most in that it used a heck of a lot of sockets, but did not require any set up. It came out about the time I was born - about 1952 or so.
When I was in college in the 70's was the first and last time I saw one. It was easy to use if you could figure out the right socket to stick your tube in and it had no tube chart.