[DeckApe]

I think I've said elsewhere on here... I own an Eico 666 tube tester. I'm still not sure what encouraged Eico to choose that particular model number, but the unit itself isn't bad, and can handle all tubes from four to nine pins. Eico's settings-charts are reported to be a little wobbly, so I recommend obtaining a few different editions and going with majority rules where possible.

Probably not the most popular unit around, but even in good shape you won't pay Hickok prices.