Much to my surprize,
I found an unopened envelope with the original
paperwork for this tester. As you can see, it was manufactured by Mercury.
It came with the schematic, tube substitution guide, warranty card and
Here is the original blank warranty registration card.
Plenty of tube storage. I also have the keys to lock the door.
Here is another
great ebay find, a 1940's lighted tube tester
sign I am going to hang from chains above my self service tube tester.
The sign on top of my tube tester to show how large this sign is.