Matched Pair Sylvania 6AU6 Vacuum Tubes Valves NOS-Testing RCA Black Plate The Hickok-tested 6AV5 tested 4200

The Hickok-tested 6AV5 tested 4200 micromhos where new/nominal is 3900

They have 0-09 188-5 and 9-04 188-5 date / provenance codes

Date Codes: none

48 and 48 where minimum (65%) is 40 and 100% is 62

a fence-like strip on top of the top spacer and dimpled sheet getters

Matched Pair Sylvania 6AU6 Vacuum Tubes Valves NOS-Testing RCA Black Plate The Hickok-tested 6AV5 tested 4200This new old stock testing matched pair of Sylvania 6AU6 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 for Tube One and 84 for Tube Two where minimum (65%) is 58. These tubes have top, U getters; gray plates and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with Aimee