6AB8

6AB8 is also designated ECL80.

Description

The 6AB8 is a triode-pentode, heater-type tube with an indirectly heated cathode, designed for operation on alternating or direct current. It has a T6½ bulb with a maximum body length of 2⅜ inches and a small button 9-pin (Noval) base.

Heater

The heater is rated for 6.3 volts at 300 mA. It is suitable for parallel or series supply on AC or DC.

Ratings

The triode section has a maximum plate voltage of 550 V, a maximum plate dissipation of 1 W, and a maximum peak cathode current of 200 mA. The pentode section has a maximum plate voltage of 550 V, a maximum plate dissipation of 3.5 W, a maximum screen grid voltage of 250 V, a maximum screen grid dissipation of 1.2 W, and a maximum peak cathode current of 350 mA. For both sections, the maximum heater-cathode voltage is 150 V and the maximum external heater-cathode resistance is 20 kΩ. For the pentode section, the maximum grid No. 1 circuit resistance is 2 megohms with cathode bias and 1 megohm with fixed bias.

Capacitances

For the triode section, the plate-to-cathode capacitance is 2.1 pF, the grid-to-cathode capacitance is 0.8 pF, and the plate-to-grid capacitance is 0.9 pF. For the pentode section, the grid-to-cathode capacitance is 4.3 pF, the plate-to-cathode capacitance is 4.8 pF, the plate-to-grid No. 1 capacitance is 0.2 pF, and the grid No. 1-to-filament capacitance is less than 0.25 pF.

Characteristics

Typical triode characteristics at a plate voltage of 100 V and grid voltage of 0 V are a plate current of 8 mA and a transconductance of 1.9 mA/V.

Applications

The triode section is intended for use as an audio-frequency preamplifier and oscillator. The pentode section is intended for use as a synchronizing pulse separator, frame output valve, and audio output valve.

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 6AB8, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• ECL80 PHILIPS (filed under ECL80)
• OPERATING CONDITIONS OF THE PENTODE SECTION AS A POWER AMPLIFIER

2 further designations appear alongside 6AB8 in the literature but below the evidence threshold used here, so they are not listed as equivalent.