3S4

3S4 is also designated DL92.

Description

The 3S4 is an output pentode for battery receivers, with a directly heated filament and a miniature base. Its envelope type is A 19-2, and its mounting position is unrestricted.

Filament Arrangement

The filament can be supplied in series or in parallel. With parallel supply, the filament voltage is 1.4 V and the filament current is 100 mA. With series supply, the filament voltage is 2.8 V and the filament current is 50 mA. The filament is brought out to pins 1 and 7, with a centre tap on pin 5.

Ratings

The maximum anode voltage is 90 V, and the maximum grid 2 voltage is 67.5 V. Maximum anode dissipation is 0.7 W, and maximum grid 2 dissipation is 0.15 W. The maximum grid 1 voltage is +0.2 V, and the maximum grid 1 resistance is 2 MΩ. With filaments in parallel, the maximum cathode current is 11 mA; with filaments in series, it is 5.5 mA.

Characteristics

With filaments in parallel, at Va = 67.5 V, Vg2 = 67.5 V, and Vg1 = −7 V, the anode current is 7.2 mA; at Va = 90 V with the same other voltages, it is 7.4 mA. The anode impedance is 0.1 MΩ. Transconductance is 1.55 mA/V at Va = 67.5 V and 1.57 mA/V at Va = 90 V. Output power is 180 mW at Va = 67.5 V and 270 mW at Va = 90 V.

With filaments in series, at Va = 67.5 V, Vg2 = 67.5 V, and Vg1 = −7 V, the anode current is 6 mA; at Va = 90 V with the same other voltages, it is 6.1 mA. The anode impedance is 0.1 MΩ. Transconductance is 1.4 mA/V at Va = 67.5 V and 1.42 mA/V at Va = 90 V. Output power is 160 mW at Va = 67.5 V and 235 mW at Va = 90 V.

Capacitances

The interelectrode capacitances are Cg1 = 4.35 pF, Ca = 6.0 pF, and Cag1 < 0.4 pF.

Pinout

Pin 1 is the filament, pin 2 is the anode, pin 3 is grid 1, pin 4 is grid 2, pin 5 is the filament centre tap, pin 6 is the anode, and pin 7 is the 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 3S4, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• - Hiniwati (filed under DL92)
• LIMITES MAXIMALES D'UTILISATION

2 further designations appear alongside 3S4 in the literature but below the evidence threshold used here, so they are not listed as equivalent.