1S2A

1S2A is also designated DY87.

Description

The 1S2A is a half-wave vacuum rectifier designed for high-voltage, low-current applications in television scanning systems. It is a high-vacuum single-anode rectifying tube for high tension in television receivers, with an indirectly heated cathode with parallel supply.

Construction

The envelope of the 1S2A is chemically treated to prevent flash-over under conditions of high humidity and low atmospheric pressure. The tube has a NOVAL base. Pins 1, 4, 6, and 9 can be used for fixing an anti-corona ring. Pins 3 and 7 may be connected to circuit elements having the same potential as the heater, but must never be earthed.

Ratings

The heater requires 1.4 volts at 0.55 amperes. The peak plate inverse voltage has an absolute limit of 22,000 volts, with a further absolute limit of 27,000 volts also cited. The maximum output current is 0.8 milliamperes, and the peak plate current is 40 milliamperes. The maximum filter input capacitor is 2,000 picofarads.

Characteristics

Output capacitance without external shield is 1.55 picofarads, as given by the Philips datasheet for anode capacitance. The Amperex datasheet gives an operating characteristic at an output current of 0.15 milliamperes and an output voltage of 18,000 volts; the Philips datasheet similarly states an operating characteristic at 0.15 milliamperes and 18 kilovolts.

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 1S2A, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• **PHILIPS** (filed under DY87)
• AMPEREX TUBE TYPE 1S2A