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6FR7

Small Signal Triode — Noval

↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

6CG76FQ7

Similar Tubes (Not Drop-In Compatible)

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

Same electricals but 8.4V heater — not directly interchangeable

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

1Anode (section 2)

2Grid (section 2)

3Cathode (section 2)

References

https://frank.pocnet.net/sheets/127/6/6CG7.pdf
https://tdsl.duncanamps.com/show.php?des=6FR7

Anode Current

Anode Current

9mA

Anode ResistanceAnode Resistance7,700Ω

TransconductanceTransconductance2.6mA/V

Amplification Factor (μ)Amplification Factor20—

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.6A

4Heater

5Heater

6Anode (section 1)

7Grid (section 1)

8Cathode (section 1)

9Internal shield