Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods Compactron It is dead quiet when

It is dead quiet when the preamp is muted and has excellent frequency response and sound-staging

There were no shorts or gas and they measured as follows (from left to right

Plates: gray ladder plate

copper support rods

new in box matched pair of Tung-Sol 6AK5 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair General Electric GE 12AU7 12AU7A ECC82 Vacuum Tubes Copper Support Rods Compactron It is dead quiet whenThis nicely matched pair of General Electric 12AU7 ECC82 dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 65 66 while Tube Two measured 69 64 where minimum (65%) is 56 56 and 100% is 87 87. These tubes have narrow 19 MM plates, each with two rectangular holes; O getters; copper support rods and excellent flashing. I have played them in my Radio Craftsmen RC 2