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UEL84
Power Pentode — Noval
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Philips
↗ Radiomuseum
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
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 100mA series-string circuits
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
Cathode Current (max)
Cathode Current (max)
65
mA
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
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
Heater
Heater Voltage
Heater Voltage
33
V
Heater Current
Heater Current
0.1
A
Notes
100mA series-string heater for AC/DC receivers. The 'U' prefix in Mullard/Philips nomenclature denotes a 100mA heater string design.
Brans Vademecum lists EL84 as the equivalent base type.
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
PL84
Heater-to-Cathode Voltage (max)
Heater-to-Cathode Voltage (max)
100
V
Max Grid Resistor
Max Grid Resistor (cathode bias)
1
MΩ
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
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
4
Heater
5
Heater
6
Internal Connection
7
Anode (Plate)
8
Internal Connection
9
Screen Grid (g2)