6EM7

6EM7 has no equivalent designation confirmed by the archive.

Description

The 6EM7 is a twin triode containing two units, designated Unit No. 1 and Unit No. 2. It has a short intermediate-shell octal 8-pin base with external barriers (JEDEC Group 1, 88-58), and its basing designation for bottom view is 88D. Pin 1 is the grid of Unit No. 2; pin 2 is the plate of Unit No. 2; pin 3 is the cathode of Unit No. 2; pin 5 is the plate of Unit No. 1; pin 6 is the cathode of Unit No. 1; pins 7 and 8 are the heater pins.

Physical Characteristics

The 6EM7 has a maximum overall length of 3 inches, a maximum seated length of 2-7/16 inches, and a maximum diameter of 1-9/32 inches. Its operating position is any.

Electrical Characteristics

For Unit No. 1, the direct interelectrode capacitance from grid to cathode and heater is approximately 2.2 picofarads, and from plate to cathode and heater is approximately 0.6 picofarads. In Class A1 amplifier operation at plate voltage 250 volts and grid voltage -20 volts, Unit No. 1 has an amplification factor of 68, a plate resistance of approximately 40000 ohms, a transconductance of 1600 micromhos, and a plate current of 1.4 milliamperes. At plate volts = 60 and grid volts = 0, Unit No. 1 plate current is 95 milliamperes maximum; at grid volts = -28, it is 10 milliamperes maximum. The approximate grid voltage for Unit No. 1 is -5.5 volts at a plate current of 10 microamperes and -45 volts at a plate current of 100 microamperes.

For Unit No. 2, in Class A1 amplifier operation at plate voltage 150 volts and grid voltage -20 volts, the amplification factor is 5.4, the plate resistance is approximately 750 ohms, the transconductance is 7200 micromhos, and the plate current is 50 milliamperes.

Original manufacturer datasheets for 6EM7, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• AVERAGE PLATE CHARACTERISTICS Unit No.1