6FR7 — Small Signal Triode, Noval | Tubeofile | Tubeofile

6FR7

Small Signal Triode — Noval

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

6CG76FQ7

Similar Tubes (Not Drop-In Compatible)

6SN7

Same electricals (mu=20, Rp=7700, gm=2600) but Octal base — requires socket adapter

8CG7

Same electricals but 8.4V heater — not directly interchangeable

8FQ7

Same electricals but 8.4V heater — not directly interchangeable

Electrical Specifications

Absolute Maximum

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

Anode Dissipation (max)Anode Dissipation (max, per section)2.8W

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)250V

Grid 1 Bias VoltageGrid Bias Voltage-8V

Notes

The 6FR7 is electrically identical to the 6CG7 and 6FQ7, with the addition of controlled heater warm-up time for use in series-string heater circuits.
Valve equivalents reference lists this as a double triode on B9A (Noval) base with 6.3V heater.

Pin Layout — Noval