Vacuum Tube - 6GH8A, Triode, Pentode
New-Old-Stock (NOS) tube.
The 6GH8-A is a miniature tube which contains a sharp-cutoff pentode and a medium-mu triode. Each section has a separate cathode and is electrically independent. The pentode section is intended primarily for service as an oscillator in the horizontal-deflection system of television receivers.