7534

7534 is also designated E130L.

The 7534 is a high-transconductance output pentode with an octal base. It uses two frame grids, one as the control grid and one as the screen grid. The tube has an indirectly heated cathode for parallel supply, with a heater voltage of 6.3 volts and a heater current of 1.7 amps. It can be mounted in any position.

Construction

The Amperex datasheet states that the frame-grid construction makes a transconductance of 25,000 micromhos possible at a screen-grid current of 4 mA. The datasheet also describes the 7534 as one of the Amperex "Premium Quality 10,000 Hour" tubes. The E130L datasheet specifies life test conditions of 10,000 hours and gives end-of-life conditions where the anode current has decreased to 60 mA or less, the transconductance has decreased to 17,500 micromhos or less, or the negative grid No. 1 current exceeds 1 microampere.

Ratings

The Amperex datasheet gives maximum ratings for the 7534 as follows: plate voltage (zero current) of 2000 volts, plate voltage of 900 volts, peak plate voltage of 6000 volts, grid No. 2 voltage (zero current) of 550 volts, grid No. 2 voltage of 250 volts, negative grid No. 1 voltage of 150 volts, plate dissipation of 27.5 watts, grid No. 2 dissipation of 5.0 watts, grid No. 1 dissipation of 0.1 watts, cathode current of 300 mA, and peak cathode current of 1.5 amps. The maximum series grid resistor value is 1 megohm for automatic bias and 0.5 megohm for fixed bias. The maximum heater-cathode voltage is 200 volts with the cathode positive with respect to the heater and 100 volts with the cathode negative. The maximum cathode-heater circuit resistance is 20,000 ohms, and the maximum bulb temperature is 225 degrees Celsius.

The E130L datasheet adds a maximum positive grid No. 1 voltage of 15 volts, a maximum anode peak voltage of 8000 volts with a pulse duration of 18% of a cycle, and a maximum anode plus grid No. 2 dissipation of 27.5 watts for triode connection, with a maximum anode and grid No. 2 voltage of 250 volts for that connection. It also gives maximum cathode peak current of 1.5 A with a pulse duration max of 4 ms and an average value max of 150 mA, and a maximum cathode peak current of 4.6 A with a pulse duration max of 1.5 microseconds and an average value max of 14 mA.

Characteristics

The Amperex datasheet lists a transconductance of 25,000 micromhos, an amplification factor from grid No. 2 to grid No. 1 of 6.5, and an internal plate resistance of 10,000 ohms. The input capacitance is 35 picofarads, the output capacitance is 17 picofarads, and the maximum plate-to-grid No. 1 capacitance is 2 picofarads. The E130L datasheet gives a mutual conductance of 27.5 mA/V and an anode current of 100 mA.

Applications

The Amperex datasheet states the 7534 is designed for use as a wide-band amplifier, as a cathode follower, as a series stabilizer in electronic power supplies, or as an output tube in class B push-pull circuits. The E130L datasheet describes the tube as a special quality tube designed for use as a wide band amplifier, cathode follower, series regulator tube for stabilised d.c. supply, and output tube. The E130L datasheet gives an output power of 11.5 W for one tube and 60 W for two tubes in class AB.

Mechanical

The Amperex datasheet states the 7534 can withstand vibrational forces of 2.5 g at 50 c/s in various directions and impact shocks up to 500 g.

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 7534, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• E130L (filed under E130L)
• AMPEREX TUBE TYPE 7534