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EL12/375 — Power Pentode, Y8A | Tubeofile
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EL12/375
Power Pentode — Y8A
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Telefunken
Data: High
High quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.
↗ TDSL
↗ Radiomuseum
Known Equivalents & Substitutes
No known equivalents. If you know of any, use the ⚑ Report Issue button above.
Similar Tubes (Not Drop-In Compatible)
EL12
Standard version rated to 250 V (Philips) / 350 V (Telefunken) — same Y8A base and pinout
EL12/325
Lower voltage-selected variant
EL12/425
Higher voltage-selected variant
EL150
Closely related Telefunken variant — same Y8A base
EL34
Successor (1950) with Octal base — not pin-compatible
Electrical Specifications
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
375
V
Screen Voltage (max)
Screen Voltage (max)
375
V
Anode Dissipation (max)
Anode Dissipation (max)
18
W
Screen Dissipation (max)
Screen Dissipation (max)
2
W
Cathode Current (max)
Notes
The '/375' suffix indicates factory selection for Va_max = 375 V operation.
Cathode-bias only — fixed bias is prohibited, same as all EL12 variants.
Approximately twice the sensitivity of the AL5.
The EL12 spez has a plate top cap — verify whether this variant also has a top cap or base anode.
Brans lists equivalents: 4654(P), 4654K, 4689(P), EL12/325, EL12spez, EL35, EL50, N150.
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
EL12/425
EL150
References
https://tdsl.duncanamps.com/show.php?des=EL12/375
https://www.radiomuseum.org/tubes/?tube=EL12/375
Cathode Current (max)
90
mA
Typical Operating
Anode Voltage (typical)
Anode Voltage
250
V
Screen Voltage (typical)
Screen Grid 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
Cathode Resistor (self-bias)
Cathode Resistor (self-bias)
90
Ω
Output
Output Power
Output Power (Class A SE, k=10%)
8
W
Load Impedance
Optimum Load Resistance
3,500
Ω
Heater
Heater Voltage
Heater Voltage
6.3
V
Heater Current
Heater Current
1.2
A
Absolute Maximum
Anode Voltage (max)
Anode Voltage (max)
375
V
Screen Voltage (max)
Screen Voltage (max)
375
V
Anode Dissipation (max)
Anode Dissipation (max)
18
W
Typical Operating
Anode Voltage (typical)
Anode Voltage (typical)
250
V
Screen Voltage (typical)
Screen Voltage (typical)
250
V
Grid 1 Bias Voltage
Grid Bias (cathode resistor, approx.)
-7
V
Anode Current
Anode Current
72
mA
Anode Resistance
Anode Resistance
Output
Output Power
Output Power (Class A SE, k=10%)
8
W
Cathode
5
Heater
6
Heater
7
Anode
8
No Connection
30,000
Ω
Transconductance
Transconductance
15
mA/V