8CY7

Compound (multi-section) — Noval

Tung-Sol

Known Equivalents & Substitutes

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

Similar Tubes (Not Drop-In Compatible)

13DR7

Brans lists as related — same structure but different heater voltage

Brans lists in same group — Noval dissimilar double triode

Brans lists in same group — similar dissimilar double triode but 6.3V heater, different operating characteristics

Brans lists in same group — similar dissimilar double triode but Octal base and 6.3V heater

Brans lists in same group — similar Noval dissimilar double triode but 6.3V heater

Electrical Specifications

Section 1 — High-Mu Triode (Oscillator)

Absolute Maximum

Anode Voltage (max)Max DC Plate Voltage350V

Anode Dissipation (max)Max Plate Dissipation1W

Cathode Current (max)Max DC Cathode Current35mA

Max Grid ResistorMax Grid Circuit Resistance (Fixed Bias)2.2MΩ

Typical Operating

Notes

Heater voltage is 7.9V (series-string design), not 6.3V — intended for series heater string television receivers.
Section 1 (oscillator): mu=68, gm=1.3 mA/V, rp=52k ohms at Va=250V, Vg=-3V.
Section 2 (amplifier): mu=5, gm=5.4 mA/V, rp=920 ohms at Va=150V (with cathode bias 520 ohms).
Max plate dissipation: Section 1 = 1W, Section 2 = 5.5W.
Max DC plate voltage: Section 1 = 350V, Section 2 = 350V (vertical oscillator), 400V max negative grid voltage for Section 2.
Heater warm-up time approximately 11 seconds.

Pin Layout — Noval

1Plate (Section 2)

2Grid (Section 2)

3Cathode (Section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible

References