New Triplett chart =4000/2100 & 6200/3300 micromhos. Vacuum Tubes. Each is tested for emission, dynamic mutual conductance, shorts, & gas as applicable. 'Matched' refers to comparing the gm test results between the lowest to the highest of the identical sections of a set of tubes.
Vacuum Tube. sections of a single tube. Within 3% I consider to be 'Balanced'. Gray Plate. Heat Radiator. Tested at 100. Clean tubes will radiate heat better & operate cooler. Dual Side O Getters.
2 x 6AU6A/EF94 Mullard Tubes. Tested on enhanced Triplet E3444 Laboratory Tester. Made in Great Britain for The Fisher. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable.
Checkout my other tubes! tubes test: 90, 90, 88, 90 %.
Tested on Triplett tube tester for shorts and leaks as well.
Ken Rad 6A3 Tube. The minimum for a good 6A3 on TV/7 is 38. Tube #1 = 70 (Approx 119%). Years ago, I put away a bunch of great Tubes. There are tens of thousands of tubes there. No shorts or leaks.
Philco 6A3 Tube. The minimum for a good 6A3 on TV/7 is 38. Tube #1 = 70 (Approx 119%). Years ago, I put away a bunch of great Tubes. There are tens of thousands of tubes there. No shorts or leaks.
Tubes checked good on a B&K 667 Tube Tester.