ECH83

Triode-Hexode — Noval

Philips

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

ECH81

Same Noval base and pinout — reportedly identical internally, only stamped differently

12.6 V heater version — same pinout but different heater voltage

Series-heater version (19 V / 100 mA) — same pinout but different heater voltage

Electrical Specifications

Section 1 — Triode (Oscillator)

Typical Operating

Anode Voltage (typical)Anode Voltage12.6V

Anode CurrentAnode Current0.75mA

TransconductanceTransconductance1.4mA/V

Amplification Factor (μ)Amplification Factor18.3—

Section 2 — Heptode (Mixer)

Typical Operating

Anode Voltage (typical)Anode Voltage12.6V

Screen Voltage (typical)Screen Voltage (g2+g4)12.6V

Anode CurrentAnode Current0.55mA

Anode ResistanceInternal Resistance500,000Ω

TransconductanceConversion Conductance (Sc)

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.3A

Notes

ECH81 and ECH83 are reportedly identical internally — only the stamp differs.
Triode and heptode sections share a common cathode.
Triode grid bias obtained by grid current biasing (Rg = 47 kohm).
Heptode grid No. 1 bias obtained by grid current biasing (Rg1 = 1 Mohm).
Conversion conductance Sc = 220 uA/V at Va=12.6V, up to 750 uA/V at higher voltages.

Pin Layout — Noval

1Heptode Anode

2Heptode Screen Grid (g2+g4)

3Common Cathode

Socket-Compatible Tubes ⚠ Not electrically compatible

References