6AT8A Triode-Pentode Vacuum Tube

6AT8A — Triode-Pentode Frequency Converter

The 6AT8A is a nine-pin miniature triode-pentode designed primarily for converter service in radio receivers. It contains one triode section and one pentode section; it is not a dual triode.

• Tube structure: triode-pentode
• Base: B9A / noval, 9-pin
• Heater: 6.3 V, 0.45 A
• Typical function: triode oscillator and pentode mixer in radio-frequency conversion circuits
• The A version has controlled heater warm-up characteristics for series-string applications.

Replacement suitability must be checked against the equipment schematic, heater arrangement and the manufacturer’s data. This is not a universal audio preamplifier replacement.

6AT8A technical datasheet (PDF)