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 86/58
Serial Numbers: SN-0752 / SN-0813
Summary: Up for sale is a New Old Stock (NOS) matched pair of Western Electric 300B vacuum tubes, tested with results of 87/58 and 86/58, serial numbers SN-0752 and SN-0813. 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 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.
We do take trade-ins, so please contact us if you wish to do so.
Please make sure to thoroughly inspect item photos for cosmetic condition. We do try to describe the item as accurately as possible, so if you have any questions about cosmetic condition please message us.
Use collapsible tabs for more detailed information that will help customers make a purchasing decision.
Ex: Shipping and return policies, size guides, and other common questions.
Recently viewed
Western Electric 300B Vacuum Tubes NOS Matched Pair Tested Spec. 87/58
