All tested with Hickok 800

Average new 2600

1 RCA clear top 2900/2800

1 RCA clear top 3000/2800

1 RCA clear top? 2 x 2600

1 RCA clear top? 2 x 2600

1 RCA clear top? 2 x 2600

1 RCA clear top? 2700/2600

1 RCA ? 2 x 2650

1 Sylvania 2 x 2600

1 Philco 2 x 2550

1 Zenith 2 x 2600

1 CBS 2 x 2550

1 Raytheon 2700/2600

1 ??? 2 x 2550