3 Westinghouse 12AU7 12AU7A ECC82 Black Plate Vacuum Tubes Lot Of Three Steel Plate NOS NIB new in box Cunningham 35/51

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

It appears brand-new with no scratches and very light surface noise only audible in quiet passages

Transconductance measured 21

It has a micanol base

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

3 Westinghouse 12AU7 12AU7A ECC82 Black Plate Vacuum Tubes Lot Of Three Steel Plate NOS NIB new in box Cunningham 35/51This 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