1AC6

1AC6 is also designated DK92.

The 1AC6 is a heptode converter tube with a coated filament, intended for use as a frequency changer in battery sets.

Construction

The 1AC6 uses a miniature button 7-pin base and a T5½ bulb. Its maximum overall length is 2 1/8 inches, maximum seated height is 1 7/8 inches, and maximum diameter is 3/4 inch. The tube may be mounted in any position. Its JETEC basing designation is 7DH.

Electrode Arrangement

Pin 2 is the plate, pin 3 is grid No.2, pin 4 is grid No.1, pin 5 is grid No.4, pin 6 is grid No.3, and pin 7 is the +filament and grid No.5.

Ratings

The filament is rated at 1.4 volts and 50 mA. Maximum plate voltage is 90 volts, with a maximum plate dissipation of 0.15 watt. Grid No.4 has a maximum voltage rating of 90 volts and a dissipation rating of 0.03 watt. Grid No.2 has a maximum voltage rating of 60 volts and a dissipation rating of 0.2 watt. Maximum cathode current is 4 mA. Maximum grid No.3 circuit resistance is 3 megohms, and maximum grid No.1 circuit resistance is 35,000 ohms.

Capacitances

Capacitance values include plate to all other electrodes at 8.4 µµF, grid No.3 to all other electrodes at 7.5 µµF, grid No.2 to all other electrodes at 4.8 µµF, and grid No.1 to all other electrodes at 3.9 µµF. Inter-electrode capacitances are: plate to grid No.1, maximum 0.11 µµF; plate to grid No.3, 0.36 µµF; plate to grid No.2, 0.3 µµF; grid No.2 to grid No.3, 1.6 µµF; grid No.1 to grid No.3, 0.2 µµF; and grid No.1 to grid No.2, 3 µµF.

Characteristics

At a filament voltage of 1.1 volts, the grid No.1 voltage is -0.2 volt when grid No.1 current is +0.3 µA. Operating characteristics with separate excitation include conversion conductance values of 300 and 325 micromhos, and plate resistance values of 0.9 and 1.0 megohm.

Oscillator section typical characteristics, measured at a filament voltage of 1.1 volts, include plate voltage values of 41, 63.5, and 85 volts; grid No.4 voltage values of 41, 63.5, and 60 volts; grid No.2 voltage values of 29, 30, and 30 volts; grid No.2 current values of 3, 2.2, and 2.5 mA; transconductance of grid No.1 with respect to grid No.2 values of 1.1, 0.8, and 0.9 mA/V; and amplification factor of grid No.2 with respect to grid No.1 values of 9, 7.5, and 7.5.

Applications

The 1AC6 can be heated by battery current, rectified A.C., or D.C., with series or parallel supply.

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 1AC6, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• 1AC6
• *Miniwatt"* DK 92 (filed under DK92)

2 further designations appear alongside 1AC6 in the literature but below the evidence threshold used here, so they are not listed as equivalent.