General Electric GE 12AT7 ECC81 6679 Vacuum Tube Premium Matched Pair 6DQ5 Tube Two measured 2930/21

Tube Two measured 2930/21

These matched pair of engraved-base

not included) in my AC-heated Alan Eaton single-ended 45 amplifier and they sound OK

This trio of RCA gray glass 12BY7 / 12BY7A tubes was tested on our Paul Hart-calibrated TV7 for shorts

Two have MISSING CENTERING PINS

General Electric GE 12AT7 ECC81 6679 Vacuum Tube Premium Matched Pair 6DQ5 Tube Two measured 2930/21This industrial grade GE 6679 12AT7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 69 65 where minimum (65%) is 50 50 and 100% is 77 77. It has gray, wing plates; a top, O getter and excellent flashing. I am playing them in my Bottlehead Crack headphone amplifier as I write. The Bottlehead calls for a 12AU7 which is a pretty different tube. That said, it has no