8CG7

Small Signal Triode — Noval

Known Equivalents & Substitutes

Similar Tubes (Not Drop-In Compatible)

12.6V heater version — not a drop-in in 8.4V circuits

Same electrical characteristics but 6.3V heater — not a drop-in in 8.4V series-string circuits

6FQ7

Same tube as 6CG7 (different JEDEC number) — 6.3V heater

6SN7GT

Electrically near-identical but Octal base — not pin-compatible

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)300V

Anode Dissipation (max)Anode Dissipation (max, each plate)3.5W

Cathode Current (max)Cathode Current (max)20mA

Heater-to-Cathode Voltage (max)Heater-to-Cathode Voltage (max)200V

Notes

8.4V / 0.45A heater for series-string TV receiver heater chains. Electrically identical to 6CG7/6FQ7 in all other respects.
GE Essential Characteristics confirms: medium-mu twin triode, 9AJ base (Noval), 8.4V/0.45A heater, Pa_max 3.5W, Va_max 300V, mu=20, gm=2600 umhos, ra=7700 ohms at Va=250V Vg=-8V.
8FQ7 is the same tube registered under a different JEDEC number (same relationship as 6CG7/6FQ7).
Not interchangeable with 6CG7/6FQ7 without heater circuit modification.

Pin Layout — Noval

1Plate (Section 2)

2Grid (Section 2)

3Cathode (Section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible