1 NOS Philco 2A4G Vacuum Tube. On the Hickok TV-7D/U tube tester the 2A4G should strike between 86 and 76 on the bias setting. This tube strikes at 80 and reads 60 after reaching the strike threshold.
1 NOS Philco 2A4G Vacuum Tube. On the Hickok TV-7D/U tube tester the 2A4G should strike between 86 and 76 on the bias setting. This tube strikes at 80 and reads 60 after reaching the strike threshold.