- Tested Very Strong - Type 24a RCA Victor 1939 ST Shape Vacuum Tube

Type No 24A Raytheon amplifier audio vacuum tube valve radio tested ST 24 224

Type No 24A Arcturus amplifier audio vacuum tube valve radio tested ST 24 224

Sylvania Type 41 Vacuum Tube ST Shape I-177B Tested

SYLVANIA TYPE 80 RECTIFIER VACUUM TUBE - TESTED NOS - CODE 5T -ST SHAPE

Sylvania 6V6 GT Vacuum Tube Very Strong Results= 4320

Type 24A ST Vacuum Tube. Hickok Tested / NOS or Near NOS Testing 1x

Sylvania 6K11 / 6Q11 / 6C10 Compactron Triple Vacuum Tube. Tested Very Strong.