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).
Item Tag: ECC88/6DJ8/6922
2 SYLVANIA 6DJ8 ECC88 6922 7308 USA Made Closely Matched Same Date Code
2 SYLVANIA 6DJ8 ECC88 6922 7308. Closely Matched. I test to the best of my ability and I report all results honestly. Hopefully we’ll be close. Tube 1: 108 / 107. Tube 2: 107 / 107 where pass/fail is 50.
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