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19BY7 — Small Signal Pentode, Noval | Tubeofile
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19BY7
Small Signal Pentode — Noval
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↗ Radiomuseum
Known Equivalents & Substitutes
UF85
Similar Tubes (Not Drop-In Compatible)
EF805S
Brans lists as equivalent — verify pin compatibility before substituting
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
170
V
Anode Dissipation (max)
Anode Dissipation (max)
3.2
W
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
170
V
Screen Voltage (typical)
Screen Voltage (typical)
170
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-2
V
Anode Current
Anode Current
11
mA
Anode Resistance
Anode Resistance
Heater
Heater Voltage
Heater Voltage
19
V
Heater Current
Heater Current
0.1
A
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
300
V
Screen Voltage (max)
Screen Voltage (max)
170
V
Anode Dissipation (max)
Notes
Series heater design: 19 V / 0.1 A for series string operation in AC/DC receivers.
The UF85 is the identical European Mullard/Philips designation.
Pin Layout — Noval
1
2
3
4
5
6
7
8
9
1
Suppressor Grid (internally connected to cathode)
2
Anode
3
500,000
Ω
Transconductance
Transconductance
6.5
mA/V
Anode Dissipation (max)
3.2
W
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
170
V
Screen Voltage (typical)
Screen Voltage (typical)
170
V
Grid 1 Bias Voltage
Grid 1 Bias Voltage
-2
V
Anode Current
Anode Current
11
mA
Anode Resistance
Anode Resistance
500,000
Ω
Transconductance
Transconductance
6.5
mA/V
Cathode
4
Heater
5
Heater
6
Screen Grid
7
Control Grid
8
Internal Screen
9
Internal Screen