15DQ8

15DQ8 is also designated PCL84.

General Description

The 15DQ8 is a triode-pentode with separate cathodes. The cathode is coated and unipotential. The base type is E9-1, the bulb type is T6 1/2, the outline is 6-3, and the basing is 9HX. The mounting position is any. The heater is rated at 15 volts and 300 mA.

Applications

The triode section is intended for use in keyed AGC, sync-separation, sync-amplification, and noise-suppression circuits. The pentode section is intended for use as a video output tube.

Ratings

For the pentode section, maximum plate voltage is 250 volts (550 volts without current), maximum plate dissipation is 4 watts, maximum grid No. 2 voltage is 250 volts (550 volts without current), maximum grid No. 2 dissipation is 1.7 watts, and maximum cathode current is 40 mA. Maximum grid No. 1 circuit resistance is 1 megohm with fixed bias and 2 megohms with automatic bias. For the triode section, maximum plate voltage is 250 volts (550 volts without current), maximum peak plate voltage at a plate current of 0.1 mA is 600 volts, and maximum cathode current is 12 mA. Maximum grid circuit resistance is 1 megohm with fixed bias and 3 megohms with automatic bias. Maximum voltage between heater and cathode is 200 volts, with a maximum circuit resistance of 20,000 ohms. For the triode section, maximum voltage between heater and cathode is 150 volts DC in either polarity. Maximum pulse duration is 18% of a cycle.

Typical Operating Characteristics

For the pentode section, typical plate voltage and grid No. 2 voltage are 170, 200, or 220 volts. At a plate voltage of 200 volts, typical plate resistance is 0.13 megohm, typical grid No. 1 bias is -2.8 volts, typical plate current is 18 mA, typical grid No. 2 current is 3.1 mA, and typical transconductance is 10,000 micromhos. At a plate voltage of 220 volts, typical transconductance is also 10,000 micromhos. The typical amplification factor of grid No. 2 with respect to grid No. 1 is 36. The datasheet dated 10.10.1958 gives the triode section's amplification factor as 65.

Capacitances

For the pentode section, grid No. 1 to all other elements except plate capacitance is 9.0 pF, plate to all other elements except grid No. 1 capacitance is 4.5 pF, maximum plate to grid No. 1 capacitance is 0.1 pF, and maximum grid No. 1 to heater capacitance is 0.1 pF. For the triode section, grid to all other elements except plate capacitance is 4.0 pF, plate to all other elements except grid capacitance is 2.3 pF, plate to grid capacitance is 2.7 pF, and maximum grid to heater capacitance is 0.1 pF. Maximum capacitance between triode plate and pentode grid No. 1 is 0.01 pF.

Base Connections

Base pin 1 is the triode grid, pin 2 is the triode plate, pin 3 is the triode cathode, pins 4 and 5 are the heater, pin 6 is the pentode plate, pin 7 is the pentode cathode, grid No. 3, and internal shield, pin 8 is grid No. 1, and pin 9 is grid No. 2.

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 15DQ8, hosted by Frank Philipse's Electron Tube Data sheets.

Documents held here and used to write this page.

• 15DQ8
• PCL84 (filed under PCL84)