RCA 12AX7A "Selected Tube" from Test Gear.

Tests 1225/1300 for gm where 1000 is good at 250 volts in a Triplett 3444/Westmore 501 laboratory tube analyzer restored and upgraded by Paul Hart.

Listening tested for excessive noise and microphonics in a Maxi-preamp 2 noise tester.

Quiet, Zero Microphonics when tapped on.

All tubes are guaranteed good or may be returned.  

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