5861

5861 is also designated EC55.

Description

The 5861 is a three-electrode tube with a coated unipotential cathode. It has a maximum overall length of 2.5 inches and a maximum diameter of 7/8 inches, and can be mounted in any position.

Ratings

The 5861 operates with a heater voltage of 6.3 volts AC or DC and a heater current of 0.4 amperes. Maximum plate voltage is 350 volts, maximum plate dissipation is 10 watts, and maximum cathode current is 40 mA. The maximum plate seal temperature is 140 degrees Celsius.

Capacitance

Direct interelectrode capacitances for the 5861 are: 0.02 µµF between plate and cathode plus heater, 2.2 µµF between grid and cathode plus heater, and 1.1 µµF between plate and grid.

Characteristics

At a plate voltage of 250 volts and a grid voltage of -3.5 volts, the plate current is 20 mA, transconductance is 6000 micromhos, and gain factor is 30.

Cooling

To limit the plate seal temperature of the 5861 to its maximum, the mass of metal in close thermal contact with the plate disc must be at least 60 grams of brass or its equivalent.

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 5861, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• U.H.F. DISC-SEAL TRIODE EC 55 (filed under EC55)
• 5861

1 further designation appears alongside 5861 in the literature but below the evidence threshold used here, so it is not listed as equivalent.