7B6

Compound (multi-section) — Loctal

Tung-Sol

Known Equivalents & Substitutes

No known equivalents. If you know of any, use the ⚑ Report Issue button above.

Similar Tubes (Not Drop-In Compatible)

6SQ7GT

Electrically similar duplex-diode high-mu triode but Octal base — not pin-compatible with Loctal

Predecessor type with similar function (duplex-diode triode) but Octal base

7C6

Sams lists as substitute — similar Loctal duplex-diode triode

7C8

Raytheon lists as substitute — Loctal duplex-diode triode with different characteristics

Electrical Specifications

Section 1 — High-Mu Triode

Absolute Maximum

Anode Voltage (max)Max Plate Voltage250V

Anode Dissipation (max)Max Plate Dissipation0.5W

Typical Operating

Anode Voltage (typical)Plate Voltage250V

Grid 1 Bias VoltageGrid Voltage-2

Notes

Nominal heater voltage is 7.0V; typical operating heater voltage is 6.3V.
The triode section has mu=100 and rp=91000 ohms — high-mu design for voltage amplification.
Minimum diode current per plate: 0.8 mA at 10V DC applied.
Maximum plate voltage rating: 250V.
Tung-Sol datasheet (August 1940) used for specifications.

Pin Layout — Loctal

1Heater

2Plate (Triode)

3Diode Plate #1

References

Anode CurrentPlate Current0.9mA

Anode ResistancePlate Resistance91,000Ω

TransconductanceTransconductance1.1mA/V

Amplification Factor (μ)Amplification Factor100—

Section 2 — Diode Units (x2)

Typical Operating

Minimum Diode CurrentMinimum Diode Current per Plate0.8mA

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.3A

Diode Plate #2

5No Connection

6Control Grid (Triode)

7Cathode

8Heater