1 x 6AQ8/ECC85 Matsushita Tube *Very Strong Testing*#7

1 x 6AQ8/ECC85 Matsushita Tube. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. Bogey(100% or New) = 5900/5900 micromhos @ 10/10 mA +/- 10%. I do combine S&H.

1 x 6AQ8/ECC85 Amperex Tube *Very Strong Testing*#6

1 x 6AQ8/ECC85 Amperex Tube. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. Bogey(100% or New) = 5900/5900 micromhos @ 10/10 mA +/- 10%. I do combine S&H.