6DX8

6DX8 is also designated ECL84.

The 6DX8 is a triode-pentode vacuum tube in the 9-pin miniature construction, fitted with a coated unipotential cathode and a miniature button base with 9 pins. It can be operated in any mounting position. The heater is rated at 6.3 volts and 0.72 amperes.

Construction

The tube uses a 9-pin miniature (Noval) base. The Philips datasheet identifies the tube as ECL 84.

Ratings

For both the triode and pentode sections, the maximum plate voltage is 300 volts. The pentode section has a maximum plate dissipation of 4 watts, a maximum grid #2 voltage of 300 volts, a maximum grid #2 dissipation of 1.7 watts, and a maximum cathode current of 40 milliamperes. The triode section has a maximum plate dissipation of 1 watt and a maximum cathode current of 12 milliamperes. The maximum grid #1 circuit resistance with fixed bias is 1 megohm for both sections; with a cathode resistor, the maximum is 2 megohms for the pentode section and 3 megohms for the triode section. The maximum voltage between heater and cathode is 200 volts, with a maximum circuit resistance between them of 20,000 ohms.

Characteristics

At a plate voltage of 200 volts and a grid #1 bias of −1.7 volts, the triode section has a transconductance of 4000 micromhos and an amplification factor of 65. At a plate voltage of 170 volts and a grid #2 voltage of 170 volts, the pentode section has a transconductance of 11000 micromhos and an amplification factor of grid #2 with respect to grid #1 of 36. The Philips datasheet gives the triode-to-pentode capacitance Cag1 as less than 0.1 pF and CgT-g1P as less than 0.01 pF.

Applications

The triode section is designed for use in circuits for keyed A.G.C., sync-separation, sync-amplification, and noise suppression. The pentode section is designed for use as a video amplifier.

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 6DX8, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• TRIODE-PENTODE MINIATURE TYPE
• PHILIPS ECL 84 (filed under ECL84)