9AQ8

9AQ8 is also designated PCC85.

The 9AQ8 is a double triode with a coated unipotential cathode, intended for use as an RF amplifier and self-oscillating mixer in television receivers. It is mounted on a small button noval 9-pin base.

Construction and Ratings

The maximum overall length of the 9AQ8 is 2 3/16 inches, with a maximum seated height of 1 15/16 inches. The bulb length, excluding tip, is 1 9/16 inches ± 3/32 inch, and the maximum diameter is 7/8 inch. The basing is JETEC designation 9DE. Pin assignments are: pin 1, plate of section 1; pin 2, grid of section 1; pin 3, cathode of section 1; pins 4 and 5, heater; pin 6, plate of section 2; pin 7, grid of section 2; pin 8, cathode of section 2.

The heater requires 9.0 volts at 0.3 ampere. Maximum ratings include a plate voltage of 550 volts without current, a plate dissipation of 2.5 watts per section, and 4.5 watts for both sections together. The maximum external resistance between grid and cathode is 1 megohm, and the maximum voltage between cathode and heater is 90 volts.

Typical Characteristics

For each section, at a plate voltage of 170 volts and a negative grid bias of −1.5 volts, typical characteristics include a plate current of 10 milliamps, a transconductance of 6200 micromhos, and an amplification factor of 50.

Operating Characteristics

As an additive mixer at a supply voltage of 200 volts, the 9AQ8 exhibits a plate current of 5.2 milliamps, a conversion conductance of 2300 micromhos, and a plate resistance of 15000 ohms. As an oscillator in television receivers at a supply voltage of 180 volts, the plate current is 8 milliamps and the plate dissipation is 1.2 watts.

Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.

Base NOVAL, viewed from below (the wiring side), pins numbered clockwise from the key. Read from the datasheet's basing table and checked against it automatically — confirm against the original datasheet before wiring.

Original manufacturer datasheets for 9AQ8, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• PCC85 (filed under PCC85)
• 9AQ8