I was happy to pick up a EICO Model 625 tube tester for $15. It is in good condition and appears to work well. The roll of settings for each tube is in good condition and a little searching on the internet supplied settings for older tubes like the number 78 in the picture below.
|EICO Model 625 Tube Tester with a number 78 tube|
|Inside the EICO 625 from diyaudioprojects.com|
|EICO Model 625 circuit diagram|
Here is the complete TUBE TEST DATA 1/1/78 for the EICO Model 625 Tube Tester