1AB6

1AB6 is also designated DK96.

The 1AB6 is a heptode vacuum tube intended for use as a frequency changer in battery-powered equipment, featuring a coated filament.

Construction

The tube uses a directly heated filament rated at 1.4 volts and 25 milliamps, which can be operated in parallel or series supply configurations. It is housed in a miniature button 7-pin bulb, type T5½, with a JETEC basing designation of 7DH. The maximum overall length is 2.205 inches, the maximum seated height is 1.955 inches, and the bulb length (excluding tip) is 1.580 inches ±0.094 inches, with a maximum bulb diameter of 3/4 inch. The tube can be mounted in any position.

Ratings

The maximum battery voltage is 90 volts, with an absolute permissible maximum of 110 volts. Maximum plate voltage is 90 volts, with a plate dissipation limit of 0.15 watt. Maximum grid No.4 voltage is 90 volts, with a dissipation limit of 0.03 watt. Maximum grid No.2 voltage is 60 volts, with a dissipation limit of 0.1 watt. Maximum cathode current is 2.6 mA. Maximum grid No.3 circuit resistance is 3 megohms, and maximum grid No.1 circuit resistance is 0.1 megohm. Filament voltage limits are 1.1 volts minimum and 1.6 volts maximum.

Electrical Characteristics

Capacitances include plate-to-all-other-electrodes at 8.4 pF, grid No.3-to-all-other-electrodes at 7.6 pF, grid No.2-to-all-other-electrodes at 4.8 pF, and grid No.1-to-all-other-electrodes at 3.9 pF. Maximum inter-electrode capacitances are 0.36 pF for plate-to-grid No.3, 0.3 pF for plate-to-grid No.2, 0.11 pF for plate-to-grid No.1, and 0.2 pF for grid No.1-to-grid No.3. Grid No.2-to-grid No.3 capacitance is 1.6 pF, and grid No.1-to-grid No.2 capacitance is 3 pF. The amplification factor of grid No.2 with respect to grid No.1 is 7.5. At a plate voltage of 64 V or 85 V, grid No.4 voltage of 64 V, grid No.3 voltage of 0 V, and grid No.2 voltage of 35 V, with grid No.1 connected to +filament, the grid No.2 current is 1.7 mA and the transconductance of grid No.1 with respect to grid No.2 is 600 micromhos. The minimum grid No.3 voltage is +0.75 V at a grid No.3 current of +0.3 μA.

Pin Connections

Pin 1 connects to filament(-), pin 2 to plate, pin 3 to grid No.2, pin 4 to grid No.1, pin 5 to grid No.4, pin 6 to grid No.3, and pin 7 to +filament.

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 1AB6, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• DK96 PHILIPS (filed under DK96)
• PHILIPS 1 AB 6

1 further designation appears alongside 1AB6 in the literature but below the evidence threshold used here, so it is not listed as equivalent.