Sylvania 6883 / 6146 (heavy duty variant of the 6146 with 12.6 Volt Filament) NOS Vacuum Tube Tested 100 % #38

NOTE: I only have a small number of these  6883 / 6146 Tubes. At some point the original boxes got damp and were not in good shape. The tubes are in excellent NOS condition

This Tube has been tested on a Dyna-Quick Model 700 Dynamic Mutual Conductance Tube Tester. This tube measures 100 % Grid Emission.

 Overview of the 6883 Vacuum TubeThe 6883 is a rugged, 12.6V filament beam power amplifier tube (ruggedized variant of the 6146 series) designed for military RF transmitters, mobile radios, and high-reliability applications in the 1950s–1960s. It features an octal base, T-9 bulb, black or gray plates, and enhanced durability for pulsed operation up to 400W output. Common manufacturers include RCA, GE, Sylvania, and Motorola.  It is a favorite for ham radio upgrades (e.g., as a 12V 6146 substitute) and vintage equipment restoration. It's prized for longevity and low distortion.