Tube 1S5 or Röhre 1S5 ID430, Diode-Pentode, Miniatur-7-Pin-Base B7G, USA 1940 and Audio Frequency shown. Radio tubes are valves.

The 1S5 is a diode pentode valve was designed for battery portable radio receivers. This short grid base pentode was designed with particular reference to AF voltage amplification. The 1.4 Volt filament is to be run from a dry cell and the 90 Volt anode rating matches standard HT batteries.

The 1S5 is a miniature tube consisting of a diode and a sharp-cutoff pentode, developed for use as a combined detector and AF amplifier in battery-powered portable devices. Pinout as seen from the bottom of the valve.

Sylvania type 1S5 is a diode pentode of the miniature construction, especially designed for detector-audio service in compact, light weight, portable equipment. The high operating efficiency allows the tube to be use with extremely low B supply voltages.

Same tube as 1S5 but built by Tungsram (T). The 1U5 has the same electrical characteristics but it uses an improved structure which greatly reduces any tendency toward microphonic effects. In addition, the diode unit is effectively shielded from the pentode unit to prevent "play-through".

The VT-172 is the American service Type designation for the commercial 1S5. The VT-172 is a diode pentode valve designed for battery portable radio receivers. This short grid base pentode was designed with particular reference to AF voltage amplification.

Feb 18, 2012 · The 1S5 is a diode and Pentode sharing a cathode/filament. The diode detects the AM and DC level is filtered for AVC/AGC. The AC (audio) is amplified in the Pentode. Finally a Beam Tetrode (1S3 or 3S4 only differ in filament) is the audio output. It thus needs twice the filament current.

The 1S5 is a diode and Pentode sharing a cathode / filament. The diode detects the AM and DC level is filtered for AVC/AGC. The AC (audio) is amplified in the Pentode. Finally a Beam Tetrode (1S3 or 3S4 only differ in filament) is the audio output. It thus needs twice the filament current.

Miniature tube containing a diode and a sharp-cutoff pentode. It is designed for use as a combined detector and audio-frequency voltage amplifier in compact battery-powered equipment.

7 pin miniature type Diode, Sharp-Cutoff Pentode used as a combined detector and af voltage amplifier in battery operated receivers.