3 Westinghouse 12AU7 12AU7A ECC82 Black Plate Vacuum Tubes Lot Of Three Steel Plate NOS NIB This Amperite 115NO30 relay tube

This Amperite 115NO30 relay tube tested to spec on our Hickok 800

Transconductance measured 21

They tested (from left to right) as follows: 35 and 52 where minimum (65%) is 40 and 100% is 62

" and "Little Bell

new in box Cunningham 35/51 tube tested to spec on our Paul Hart-calibrated TV7/U

3 Westinghouse 12AU7 12AU7A ECC82 Black Plate Vacuum Tubes Lot Of Three Steel Plate NOS NIB This Amperite 115NO30 relay tubeThis trio of Westinghouse black plate 12AU7A ECC82 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 50 58, 52 60 and 67 58, respectively where minimum (65%) is 56 56 and 100% is 86 86 I have played them in my Radio Craftsmen RC 2 monoblocks (with adapters, not included). They are dead quiet when the preamp is muted and have excellent frequency