Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve NOS-Testing 4th Quarter

Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve NOS-Testing 4th QuarterThis Valvo 12AT7 dual triode was tested on our Maxi Preamp II for shorts, gas, noise, transconductance and gain. There were no shorts, noise or gas. It will also be also as time becomes available on our Paul Hart calibrated TV7 U for a more familiar point of reference for most. Noise: 74 dB 75. 3 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 1400 1762; Gain: 53. 7 54. 4 where 50 50 is new. It sounded balanced, had excellent frequency

new in box Sylvania 5U8 tubes tested to spec on our Paul Hart-calibrated TV7/U

dimpled-sheet getters and terrific flashing

THERE WILL BE NO REPLACEMENTS FOR LOST PACKAGES

This pressing has very-light surface noise

new in box RCA 7C7s tested to spec on our Paul Hart-calibrated TV7/U

STOLEN AND LOST

new in box US-made 6GV5 tubes tested to spec on our Paul Hart-calibrated TV7/U

Flashing Quality: excellent

These tubes have tall bases

This hardcover book is in fair condition

There were no shorts or gas and they all measured 2200 micromhos where new/nominal is 2000 and minimum (65%) is 1300

Detector and First Audio 12AV6