7737

7737 is also designated E186F.

Description

The 7737 is a special-quality, long-life, shock- and vibration-resistant, low-microphonic broad-band amplifier pentode with indirect heating and parallel supply. It is intended for use in environments subject to unusually high shock and vibration conditions and where freedom from microphony is essential. The tube is one of the Amperex "Premium Quality 10,000 Hour" tubes.

Construction

The 7737 has a T-6½ small button bulb and a 9-pin base type E9-1 (9MZ), also referred to as a NOVAL base. The heater requires 6.3 volts at 320 mA for parallel supply, with a minimum heater voltage of 6.0 V and a maximum of 6.6 V.

Ratings

Maximum ratings include a plate voltage of 210 volts and a plate dissipation of 3.0 watts; under cut-off conditions, the maximum plate voltage is 400 volts. The maximum grid No. 2 voltage is 175 volts, with a maximum grid No. 2 dissipation of 0.7 watts; under cut-off conditions, the maximum grid No. 2 voltage is 400 volts. The maximum negative grid No. 1 voltage is 50 volts, and the peak negative grid No. 1 voltage is 100 volts. The maximum cathode current is 25 mA, the maximum heater-cathode voltage is 60 volts, and the maximum heater-to-cathode resistance is 20,000 ohms. The maximum series grid resistor is 0.5 megohms for automatic bias and 0.25 megohms for fixed bias. The maximum bulb temperature is 165°C.

Characteristics

The 7737 has a transconductance of 16,500 micromhos and an amplification factor (grid No. 2 to grid No. 1) of 53. Interelectrode capacitances are: plate-to-all-other-elements, 3.3 μμf; grid No. 1 to all other elements, 7.6 μμf; and plate-to-grid No. 1, 0.03 μμf maximum (given as less than 0.03 pF in one source). The Amperex datasheet gives the life expectancy as 10,000 hours under specified life-test conditions.

Mechanical Ratings

The 7737 is rated for shock of about 500 g as applied by the NRL impact machine for electronic devices. Its fatigue rating is 2.5 g, with vibrational forces applied for a period of 32 hours at a frequency of 50 c/s in each of three directions.

Applications

The 7737 has application in coaxial cable amplifiers, video amplifiers, broad-band IF amplifiers in communication links, and TV equipment.

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 7737, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• E186F (filed under E186F)
• 7737