6BA6 Philco 4 radio audio electron amplifier vacuum tubes valve tested 6BA6 EF93

Tested 1A5 Philco Vacuum Tube

(1) Tested Philco 6BA6 Tube Date Code 5021 Remote Cutoff Pentode Tube

(1) Tested Philco 6BA6 Tube Date Code 51-12 Remote Cutoff Pentode Tube (b)

6BA6 Philco 4 radio audio vintage amplifier vacuum tubes valve tested 6BA6 EF93

Philco 6AT6 Vacuum Tube Tested Good

Tested 6AL5 Philco Vacuum Tube

NOS Philco 6BA6 Vacuum tube - White Box - Tested