5993

5993 has no equivalent designation confirmed by the archive.

The 5993 is a miniature, full-wave, high-vacuum rectifier tube. It is designed to replace the 6X4 in applications where severe environmental conditions are encountered, especially in airborne equipment.

Construction

The 5993 uses a cathode-type structure rather than a filament structure to prevent filament breakage under shock and vibration, and employs a four-pillar mount structure to withstand extreme vibration and shock. The heater is of heavy gauge construction with a pure alumina insulator, and the cathode has a large area and operates at moderate temperatures. The bulb type is T-6 1/2. The tube requires a 9-pin miniature socket and can be mounted in any position.

Ratings and Characteristics

The heater is rated at 6.3 volts and draws 0.80 amperes. The maximum peak inverse voltage is 1500 volts. Maximum peak plate current per plate is 230 mA, and maximum peak surge current per plate is 1.6 amperes. The maximum DC heater-cathode potential is 500 volts. The cathode heating time is 45 seconds. The heater current at test is between 0.800 and 0.860 amperes AC.

Environmental and Mechanical Limits

The maximum altitude rating is 80,000 feet, and the maximum bulb temperature is 180°C. The maximum overall length is 2 5/8 inches, the maximum seated height is 2 3/4 inches, and the maximum diameter is 7/8 inch. When conservatively used, the tube has a life expectancy of 10,000 hours.

Reliability and Testing

The Bendix Red Bank datasheet states the tube is specifically designed for aircraft, military and industrial applications. Each tube is given a 45-hour run-in under various overload, vibration, and shock conditions, and is stabilized for 45 hours under test conditions A and B and 2 G vibration at 30 cps prior to 100% testing.

Original manufacturer datasheets for 5993, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• **FULL-WAVE RECTIFIER**