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6DA7

Compound (multi-section) — Noval

Tung-Sol

↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

6DR7 6DE7 6EM76EA76FD76BN7

Similar Tubes (Not Drop-In Compatible)

Datasheet states identical except for heater ratings and warm-up time

Brans lists as related dissimilar dual triode for vertical deflection — check pinout before substituting

Similar dissimilar dual triode for vertical circuits

Similar dissimilar dual triode but 8.4V heater — not directly interchangeable

Electrical Specifications

Section 1 — Triode (Section 1 — oscillator)

Absolute Maximum

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

Anode Dissipation (max)Anode Dissipation (max)2W

Typical Operating

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

Grid 1 Bias VoltageGrid Bias Voltage-8

Notes

Section 1 (oscillator): medium-mu triode (mu=20), Va max 300V, Pa max 2W. Section 2 (amplifier): low-mu triode (mu=6.3), Va max 500V, Pa max 6W, Ik max 40mA.
Controlled heater warm-up time of approximately 11 seconds. Maximum heater-cathode voltage 200V.
Maximum control-grid voltage: -400V (peak negative pulse) for both sections. Maximum DC control-grid voltage: -50V.

Pin Layout — Noval

1Grid (section 2)

2Anode (section 2)

3Cathode (section 2)

References

https://frank.pocnet.net/sheets/127/6/6DA7.pdf
https://tdsl.duncanamps.com/show.php?des=6DA7

V

Anode CurrentAnode Current9mA

Anode ResistanceAnode Resistance (approx.)7,700Ω

TransconductanceTransconductance2.6mA/V

Amplification Factor (μ)Amplification Factor20—

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance2.3pF

Grid-to-Cathode CapacitanceInput Capacitance2pF

Anode-to-Cathode CapacitanceOutput Capacitance0.415pF

Section 2 — Triode (Section 2 — amplifier)

Absolute Maximum

Anode Voltage (max)Anode Voltage (max)500V

Anode Dissipation (max)Anode Dissipation (max)6W

Cathode Current (max)Cathode Current (max)40mA

Typical Operating

Anode Voltage (typical)Anode Voltage (typical)150V

Grid 1 Bias VoltageGrid Bias Voltage-17.5V

Anode CurrentAnode Current40mA

Anode ResistanceAnode Resistance (approx.)1,100Ω

TransconductanceTransconductance5.7mA/V

Amplification Factor (μ)Amplification Factor6.3—

Capacitances

Grid-to-Plate CapacitanceGrid-to-Plate Capacitance6.9pF

Grid-to-Cathode CapacitanceInput Capacitance5.5pF

Anode-to-Cathode CapacitanceOutput Capacitance0.82pF

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current1A

4Heater

5Heater

6Anode (section 1)

7Grid (section 1)

8Cathode (section 1)

9Internal connection (shield)