Amperex USN CEP 6922 (6DJ8 ECC88)Gold Pin Vacuum Tube TV7&Maxi Tested NOS. Closely balanced sides for gain at~ 4 %. Also balanced for GM. Nice printing. Mutual Conductance (GM)Test: 100 & 91 (83 = NOS Average & 50 = Good MINIMUM).
Amperex USN CEP 6922 (6DJ8 ECC88)Gold Pin Vacuum Tube TV7&Maxi Tested NOS. Closely balanced sides for gain at~ 4 %. Also balanced for GM. Nice printing. Mutual Conductance (GM)Test: 100 & 91 (83 = NOS Average & 50 = Good MINIMUM).