1AH5

1AH5 is also designated DAF96.

Description

The 1AH5 is a diode pentode combining a diode section and an audio-frequency pentode section. It has a coated filament, a miniature button 7-pin base, and a T5 bulb. The maximum overall length is 2.205 inches, the maximum seated height is 1.955 inches, the bulb length excluding tip is 1.580 inches ± 0.094 inches, and the maximum diameter is 3/4 inch. The tube may be mounted in any position. Its JETEC basing designation is 7DJ.

Pin Connections

Pin 1 connects to grid No. 3 and the filament negative side. Pin 2 is not connected. Pin 3 connects to the diode plate. Pin 4 connects to grid No. 2. Pin 5 connects to the pentode plate. Pin 6 connects to grid No. 1. Pin 7 connects to the filament positive side. The diode is located at the negative end of the filament.

Ratings

The filament voltage is 1.4 volts, with a range of 1.1 to 1.6 volts, and a filament current of 25 mA. For the pentode section, the maximum plate voltage is 90 volts, the maximum plate dissipation is 0.03 watt, the maximum grid No. 2 voltage is 90 volts, the maximum grid No. 2 dissipation is 0.01 watt, the maximum cathode current is 0.25 mA, and the maximum grid No. 1 circuit resistance is 10 megohms. For the diode section, the maximum peak inverse plate voltage is 100 volts, the maximum plate current is 0.2 mA, and the maximum peak plate current is 1.2 mA.

Capacitances

Direct interelectrode capacitances are as follows: from grid No. 1 to all other elements, 2.1 μμF; from the pentode plate to all other elements, 2.9 μμF; from the pentode plate to grid No. 1, maximum 0.3 μμF; from the diode plate to all other elements, 1.0 μμF; from the diode plate to the pentode plate, maximum 0.9 μμF; and from the diode plate to the pentode grid, maximum 0.03 μμF.

Operating Characteristics

The datasheet states that the amplification factor of the pentode section is 52 to 62 and that the distortion at an output voltage of 5 volts is 2.5% to 1.2%. Operating conditions are given for use as a resistance-coupled amplifier with a supply voltage of 64 or 85 volts, including a load resistance of 1 megohm, a grid No. 2 resistor of 3.3 megohms, a grid No. 1 resistor of 10 megohms, and a grid No. 1 resistor for the following tube of 2 megohms. Plate current in these conditions is 32 to 50 μamps and grid No. 2 current is 9 to 15 μamps. The datasheet also states that the tube can be used without special precautions against microphony in circuits in which the input voltage exceeds 20 millivolts for an output of 50 milliwatts of the output tube, and that the absolute permissible maximum battery voltage is 110 volts.

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 1AH5, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• **1AH5**
• DIODE PENTODE (filed under DAF96)

1 further designation appears alongside 1AH5 in the literature but below the evidence threshold used here, so it is not listed as equivalent.