Excellent 1957 GE / Bendix JG 5751 WA / “12AX7” Premium High-Fidelity Beam Power Twin-Triode, B9A base high-mu vacuum tubes. Black 14mm Plates. Hard to tell, looks like large horse shoe getter, 3x triple mica, Military Specification tube. The actual silkscreen is overall very good! Military contractor box with typical one flap issue. Gain factor ~ 70-80. Nice rare addition to any collection, early 5751WA tube! These sound Fantastic, truly! 🎶

The heater current is slightly higher in this version than the conventional tubes of this particular type.

Hickok tested 32; t1; 67, t2: 70 balanced performance tube!

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