6CG7 — Small Signal Triode, Noval | Tubeofile

6CG7

Small Signal Triode — Noval

Known Equivalents & Substitutes

6FQ76CG7EH70266CC10

Similar Tubes (Not Drop-In Compatible)

12.6V heater version — not a drop-in in 6.3V heater circuits

6180

Electrically similar twin triode but different pin connections

Same electrical characteristics but Octal base with top-cap grid on one section — different pin topology

6SN7GT

Electrically near-identical (same mu, gm, ra) but Octal base — not pin-compatible

Electrically identical but Loctal base — not pin-compatible with Noval

Identical except 8.4V heater — not a drop-in in 6.3V heater circuits

Identical except 8.4V heater (same tube as 8CG7) — not a drop-in in 6.3V heater circuits

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

Introduced by RCA in 1955 as the miniature Noval-base replacement for the Octal 6SN7GT. Electrically nearly identical to the 6SN7GT (mu=20, gm=2.6 mA/V, ra=7700 ohms at Va=250V, Vg=-8V).
The 6FQ7 is the same tube registered under a different JEDEC number; 7026 is a premium-grade selected version.
Features a controlled heater warm-up time (approx. 11 seconds), making it suitable for series-string heater chains in television receivers.
GE datasheet specifies Pa_max of 3.5W per plate in Class A1 amplifier service; Tung-Sol datasheet specifies 4.0W per plate. The more conservative GE rating is used here; Tung-Sol ratings apply to their specific construction.
Maximum grid circuit resistance is 1.0 MOhm with fixed bias, 2.2 MOhm with cathode bias (GE ratings).

Pin Layout — Noval

1Plate (Section 2)

2Grid (Section 2)

3Cathode (Section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible

References