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EL150 — Power Pentode, Y8A | Tubeofile | Tubeofile
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EL150
Power Pentode — Y8A — Telefunken
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Data: Medium
Medium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
EL12/350
Similar Tubes (Not Drop-In Compatible)
EL12
Near-identical base design — same Y8A base, similar characteristics
EL12/325
Similar voltage-selected variant of EL12
EL12/375
Higher voltage-rated variant
EL12N
Related variant with different maximum ratings
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
350
V
Screen Voltage (max)
Screen Voltage (max)
350
V
Anode Dissipation (max)
Anode Dissipation (max)
18
W
Typical Operating
Anode Voltage (typical)
Anode Voltage
250
V
Notes
Closely related to the EL12 family — valve equivalents reference lists it as a pentode with G8A (Y8A steel) base.
The EL150 is normally replaceable with the EL12/350 per Radiomuseum data.
Cathode-bias only — follows the same bias restrictions as the EL12 family.
Referenced in Taschenbuch zum Rohren-Codex 1948/49.
Pin Layout — Y8A
1
2
3
4
5
6
7
8
1
Suppressor Grid (internally connected to cathode)
2
Screen Grid
3
Control Grid
4
Socket-Compatible Tubes
⚠ Not electrically compatible
EL12
EL12/375
EL12/425
References
https://tdsl.duncanamps.com/show.php?des=EL150
https://www.radiomuseum.org/tubes/?tube=EL150
Screen Voltage (typical)
Screen Voltage
250
V
Grid 1 Bias Voltage
Grid Bias
-7
V
Anode Current
Anode Current
72
mA
Screen Current
Screen Grid Current
8
mA
Anode Resistance
Anode Resistance
30,000
Ω
Transconductance
Transconductance
15
mA/V
Output
Output Power
Output Power (Class A SE)
8
W
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
1.2
A
Cathode
5
Heater
6
Heater
7
Anode
8
No Connection