6188

6188 has no equivalent designation confirmed by the archive.

Description

The 6188 is a ruggedized, high-mu, twin triode in octal base, bantam construction. Its two triode sections are electrically independent except for a common heater, whose sections are series connected internally, allowing simultaneous use in completely different applications. The tube has a coated unipotential cathode.

Construction and Ratings

The 6188 uses an 8-pin octal base with an intermediate shell made of low loss phenolic. The heater is rated at 6.3 volts and 0.3 ampere, AC or DC, with a tolerance of ±0.6 volts. Maximum ratings include a plate voltage of 275 volts, plate dissipation of 1.1 watts per plate, bulb temperature of 165 degrees Celsius, and heater-cathode voltage of 100 volts, positive or negative. The amplification factor is given as 55 to 85, with typical values ranging from 62 to 78.

Applications

The 6188 is intended for general purpose applications as voltage amplifiers, oscillators, and multivibrators. It may be used in applications requiring extreme stability such as balanced amplifiers and where large grid resistors may be necessary. It is especially suited for balanced high gain DC amplifier service and for use in military and industrial airborne equipment subjected to severe shock and vibration. The tube can be used in any mounting position.

Operating Characteristics

In Class A1 amplifier service, each section of the 6188 has a plate voltage of 250 volts, grid voltage of -2.0 volts, plate current of 2.3 mA, transconductance of 1600 micromhos, amplification factor of 70, and plate resistance of 44000 ohms. The plate current difference between sections is specified as ±0.1 Vdc.

Testing and Life

The datasheet specifies various tests for the 6188, including a noise and microphonics test at Ef=6.3Vac, Eb=200Vdc, Ec=0, RL=0.1 megohm, with a maximum of 50 mVac; a low pressure voltage breakdown test at pressure 55±5 mm Hg and voltage 500 Vac; a stability life test at Eb=250Vdc, Ec=1.0Vdc, Ehk=±100Vdc, Rg=1.0 megohm, at room temperature; an intermittent life test with envelope temperature of +465 degrees Celsius; a vibration heater cathode leakage test at Ehk=±100 Vdc; a grid current test with a maximum of -0.5 μAdc; an AC amplification test with a maximum of 8.0 mVac; and post shock and vibrational fatigue test end points. A 1 hour stability life test requires that the end point Δ transconductance of individual tubes not exceed 10 percent.

Original manufacturer datasheets for 6188, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• RATINGS ABSOLUTE MAXIMUM SYSTEM