809

809 has no equivalent designation confirmed by the archive.

The 809 is a transmitting vacuum tube intended for use as an RF power amplifier and oscillator, and is designed for Class C telegraphy, plate-modulated Class C telephony, and Class B telephony service.

Construction

The 809 is a triode of unspecified construction details in the available data.

Ratings

For Class C telegraphy service, the tube has a maximum DC plate voltage of 750 volts in continuous commercial service and 1000 volts in intermittent commercial and amateur service. The maximum DC grid voltage is -200 volts, the maximum DC plate current is 100 mA, and the maximum DC grid current is 35 mA. The maximum plate input is 75 watts in continuous commercial service and 100 watts in intermittent commercial and amateur service, with a maximum plate dissipation of 25 watts in continuous commercial service and 30 watts in intermittent commercial and amateur service.

For plate-modulated RF power amplifier service, the maximum DC plate voltage is 600 volts, the maximum DC grid voltage is 200 volts, the maximum DC plate current is 83 mA, and the maximum DC grid current is 35 mA. The maximum plate input is 50 watts, and the maximum plate dissipation is 17.5 watts.

Applications

Typical Class C telegraphy operation is specified at DC plate voltages of 500, 750, or 1000 volts, with peak RF grid voltages of 135, 140, or 160 volts. Typical plate-modulated RF power amplifier operation (carrier conditions with a maximum modulation factor of 1.0) is specified at DC plate voltages of 500, 750, and 1000 volts, with DC grid voltages of -5, -10, and -30 volts, peak RF grid voltages of 35, 40, and 60 volts, DC plate currents of 50, 50, and 45 mA, DC grid currents of approximately 6, 5, and 4 mA, driving power of approximately 14, 1.4, and 1.5 watts, and power outputs of approximately 7.5, 12.5, and 15 watts. For Class B telephony service, typical operation includes a DC plate voltage of 600 volts and a peak RF grid voltage of 135 volts.

The datasheet notes that when the tube is used in a final amplifier or a preceding stage of a transmitter designed for break-in operation and oscillator keying, a small amount of fixed bias must be used to maintain the plate current at a safe value. It states that with a plate voltage of 1000 volts, a fixed bias of at least -10 volts should be used. The datasheet also references data on operating frequencies given on the sheet TRANS. TUBE RATINGS vs FREQUENCY.

The 809 datasheet is dated DEC. 20, 1946.

Original manufacturer datasheets for 809, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• 800