Baldwin Select Sylvania 12AU7 12AU7A ECC83 Vacuum Tube Valve With An Introduction IN NEARLY 9000 SALES

IN NEARLY 9000 SALES

I am playing them as I write in on of my Sound Craftsmen RC-2 monoblock amplifiers with RCA Living Stereo's CD of Bartok's "Concerto For Orchestra

They have NU 188-5 and 3-09 188-5 date/provenance codes

It has outstanding silkscreening

Transconductance measured 58 for Tube One and 59 for Tube Two where minimum (65%) is 40

Baldwin Select Sylvania 12AU7 12AU7A ECC83 Vacuum Tube Valve With An Introduction IN NEARLY 9000 SALESThis Sylvania MANUFACTURED, Baldwin BRANDED and SELECTED 12AU7A ECC82 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured an almost perfectly balanced 82 84 where minimum (65%) is 56 56 and 100% is 86 86. This tube has narrow, gray, 16 MM plates; excellent flashing; a top, O getter; copper support rods; excellent silkscreening and 312 132 provenance date