12AC5

12AC5 is also designated UF41.

The 12AC5 is a remote cut-off R.F. pentode with a coated unipotential cathode and an E8-30 base. Its basing connections are designated 8GW, as specified in JETEC release #1526, dated October 10, 1955.

Construction

The tube has a maximum overall length of 2-3/8 inches (60 mm), a maximum seated height of 2-1/16 inches (53 mm), and a maximum diameter of 7/8 inch (22 mm). It may be mounted in any position. The heater requires 12.6 volts at 0.1 amps.

Basing

Pin 1 is the heater, pin 2 is the plate, pins 3 and 4 are internal connections, pin 5 is Grid No. 2, pin 6 is Grid No. 1, pin 7 is the cathode, Grid No. 3, and internal shield, and pin 8 is the heater.

Ratings

Maximum ratings include a plate supply voltage of 550 volts, a plate voltage of 250 volts, and a plate dissipation of 2 watts. For Grid No. 2, the maximum supply voltage is 550 volts; the maximum Grid No. 2 voltage is 250 volts when plate current is less than 4 mA, and 150 volts when plate current is 7.2 mA. Maximum Grid No. 2 dissipation is 0.3 watts. Maximum cathode current is 10 mA, and maximum Grid No. 1 circuit resistance is 3 megohms. The maximum voltage between heater and cathode is 150 volts, and the maximum external resistance between heater and cathode is 20,000 ohms.

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.

Original manufacturer datasheets for 12AC5, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• UF41 (filed under UF41)
• BASING CONNECTIONS 8GW

2 further designations appear alongside 12AC5 in the literature but below the evidence threshold used here, so they are not listed as equivalent.