Application: Single-ended and push-pull amplifier output stages, power outputs of approx. 10W or less at relatively low plate voltages
Filament: Directly heated, oxide-coated filament; 5.0V AC or DC, nominal 1.2A current
Base/Mounting: Medium four-pin thrust-type base, compatible with WE 143B or similar sockets; mountable vertically or horizontally
Interelectrode Capacitance: Grid to plate 15 μμF, grid to filament 9 μμF, plate to filament 4.3 μμF
Condition: NOS (New Old Stock)
Matching: Factory matched pair
Test Results: 87/58 and 87/58
Serial Numbers: SN.0752 / 0752
Summary: Up for sale is a New Old Stock (NOS) matched pair of Western Electric 300B vacuum tubes, tested with matching results of 87/58 and 87/58, serial numbers 0752. The 300B is one of the most legendary tubes in audio history, prized for its directly heated, oxide-coated filament design that delivers a lush midrange, smooth treble, and remarkably natural, "live" timbre. As a closely matched pair, these tubes offer balanced performance ideal for push-pull configurations, or paired individually in single-ended triode (SET) amplifier designs where the 300B is especially revered. A great opportunity to acquire genuine, unused NOS Western Electric tubes for a 300B-based amplifier — a true reference tube for anyone chasing that classic, musical, tube-driven sound. Test results and serial numbers are documented and available for verification.
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Western Electric 300B Vacuum Tubes Match Pair NOS Tested Spec 87/58 87
