EL156

Name: EL156
Brand: Telefunken

Power Pentode — Magnoval — Telefunken

Data: HighHigh quality — base, heater, all universal parameters present, and ≥50% of desirable parameters filled in. Safe to use for design decisions.

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Known Equivalents & Substitutes

EL156A

Electrical Specifications

Section 1 — Pentode

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)800V

Screen Voltage (max)Screen Voltage (max)450V

Anode Dissipation (max)Anode Dissipation (max, cathode bias)50W

Screen Dissipation (max)Screen Dissipation (max, music)12W

Notes

Uses German Steel 10-pin (Y10A / Stahl 10 / G10A) base, which is not a standard octal, noval, or magnoval socket. Requires a dedicated Y10 socket.
A Magnoval-based variant also exists (EL156 Magnoval) but is not pin-compatible with the original Y10A version.
Max anode dissipation differs by bias type: 50W with cathode (auto) bias, 40W with fixed bias.
Screen grid dissipation limit depends on drive level: 8W at Ug1eff=0, but 12W permissible with speech and music signals.
In triode connection, max combined screen voltage is 500V (vs 450V in pentode mode). Telefunken recommends keeping combined anode+screen dissipation below 35W in triode mode.
A 100 Ohm screen stopper resistor is required before the screen grid in push-pull AB operation.
Pins 3 and 4 are internal connections (beam plates) and must not be connected externally.
Predecessor: EL151. Production period: 1952-1973.

Pin Layout — Magnoval

1Heater

2Heater

3

References