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PL84 — Power Pentode, Noval | Tubeofile
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PL84
Power Pentode — Noval
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Philips
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
15CW5
Similar Tubes (Not Drop-In Compatible)
6BQ5
American designation for EL84 — same electrical characteristics but 6.3V heater
8BQ5
8.4V heater variant of EL84 — different heater voltage
EL84
Same electrical characteristics but 6.3V/0.76A parallel heater — not a drop-in in 300mA series-string circuits
UEL84
100mA series-string heater version of EL84 — different heater voltage
Electrical Specifications
Section 1 — Pentode
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
12
W
Screen Dissipation (max)
Screen Dissipation (max)
2
W
Notes
300mA series-string heater (15V/0.3A) for AC/DC TV receivers. The 'P' prefix in Mullard/Philips nomenclature denotes a 300mA heater string design.
Valve Equivalents database confirms B9A base, 15V heater.
Philips interchange lists 15CW5 as the American equivalent designation.
Electrically identical to EL84 in all electrode characteristics; only the heater differs.
Not interchangeable with EL84/6BQ5 without heater circuit modification.
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Internal Connection
2
Control Grid (g1)
3
Cathode (g3 internally connected)
Socket-Compatible Tubes
⚠ Not electrically compatible
6P43P
8BQ5
EL84
EL85
UEL84
Cathode Current (max)
Cathode Current (max)
65
mA
Heater-to-Cathode Voltage (max)
Heater-to-Cathode Voltage (max)
100
V
Max Grid Resistor
Max Grid Resistor (cathode bias)
1
MΩ
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
250
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-7.3
V
Anode Current
Anode Current
48
mA
Screen Current
Screen Current
5.5
mA
Anode Resistance
Anode Resistance
38,000
Ω
Transconductance
Transconductance
11.3
mA/V
Cathode Resistor (self-bias)
Cathode Resistor (self-bias)
135
Ω
Output
Output Power
Output Power
5.7
W
Load Impedance
Load Impedance
4,500
Ω
Capacitances
Grid-to-Plate Capacitance
Grid-to-Plate Capacitance
0.5
pF
Grid-to-Cathode Capacitance
Grid-to-Cathode Capacitance
10.8
pF
Anode-to-Cathode Capacitance
Anode-to-Cathode Capacitance
6.5
pF
Section 2 — Triode Strapped
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Anode Dissipation (max)
Anode Dissipation (max)
12
W
Cathode Current (max)
Cathode Current (max)
65
mA
Typical Operating
Anode Voltage (typical)
Anode Voltage
250
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-9.5
V
Anode Current
Anode Current
35
mA
Anode Resistance
Anode Resistance
2,000
Ω
Transconductance
Transconductance
8.5
mA/V
Amplification Factor (μ)
Amplification Factor (μ)
17
—
Cathode Resistor (self-bias)
Cathode Resistor (self-bias)
270
Ω
Output
Output Power
Output Power
1.95
W
Load Impedance
Load Impedance
3,500
Ω
Heater
Heater Voltage
Heater Voltage
15
V
Heater Current
Heater Current
0.3
A
4
Heater
5
Heater
6
Internal Connection
7
Anode (Plate)
8
Internal Connection
9
Screen Grid (g2)