12AT7 ECC81 Vacuum Tube Triple 3 Mica For Your Univalve

12AT7 ECC81 Vacuum Tube Triple 3 Mica For Your UnivalveThis triple mica 12AT7 ECC81 dual triode was tested on our Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 2800 3100 micromhos where new 12AT7s ECC81 typically test within 1. 5 standard deviations of 4000 micromhos. This variety has copper support rods; gray plates; two additional, vertical support rods for lowered microphonics; a solid, top O getter and excellent flashing. It sounded balanced,

100% is 56/56

there is no dust jacket

I just cleaned this four LP set on my VPI 16

new in box 12A7 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40

new in box Amperex mesh plate

This Radio Shack / Realistic 6AF11 tube tested to spec on our Paul Hart-calibrated TV7/U

This Sylvania milspec 6H6 / VT-90-A tube was tested on our Paul Hart-calibrated TV7/U for shorts

These eight US-made 1620 / 6J7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

new in box Sylvania 35W4 tubes tested to spec on our Paul Hart-calibrated TV7/U

I will test it

top O getters and nice flashing