Sylvania 6AV5GA Vacuum Tube

Sylvania 6AV5GA Vacuum Tube is a beam power pentode designed for use as a line time base output valve in late-1950s television circuitry. The glass envelope measures about 36 mm in diameter and, excluding the base pins, is roughly 79 mm tall, reflecting its compact IO-base form factor used in tight chassis. This valve is intended for series heater chain operation in television sets and lists a heater current around 1.2 A, which informs how it is powered within a tube-string supply. As a beam pentode, it serves as a relatively high-gain timing/amp stage in line-time-base circuits, supporting horizontal timing, sync, and raster generation in vintage CRT gear. The 6AV5GA belongs to a family of AV5GA tubes from the era, with related variants such as 12AV5-GA and 25AV5-GA designed for different heater voltages, illustrating how manufacturers adapted the same internal structure for multiple power-supply configurations. Sylvania (GTE/Sylvania) produced these tubes for use in American television equipment in the mid-to-late 1950s, and today they remain sought after by restorers of classic CRT hardware.