6BQ7A

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.

↗ TDSL ↗ Radiomuseum

Known Equivalents & Substitutes

6BQ76BZ76BS86BC86BZ86BX86HK8X155ECC180CV53654BQ7A5BQ7A6CH76CX7

Similar Tubes (Not Drop-In Compatible)

6BK7

Semi-remote cutoff twin triode on same 9AJ base — may not work in all circuits per Sams substitution guide

6BK7A

Semi-remote cutoff twin triode on same 9AJ base — may not work in all circuits per Sams substitution guide

6BK7B

Semi-remote cutoff twin triode on same 9AJ base — may not work in all circuits per Sams substitution guide

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Plate Voltage (max)250V

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

Cathode Current (max)Cathode Current (max)20mA

Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max)200V

Max Grid Resistor

Notes

Pin 9 (internal shield) should be grounded; with external shield (RETMA 315) connected to pin 9.
In cascode amplifier service with both sections in series, Va_max may be as high as 300 V under cutoff conditions.
4BQ7A (Vh=4.2V, Ih=0.6A) and 5BQ7A (Vh=5.6V, Ih=0.45A) are heater-voltage variants with controlled warm-up characteristics for series-string television receivers.
Replaced the 6BQ7 within two years of its introduction, offering approximately 12% higher gain with otherwise identical characteristics.

Pin Layout — Noval

1Plate (Section 2)

2Grid (Section 2)

3Cathode (Section 2)

Socket-Compatible Tubes ⚠ Not electrically compatible

12AT7 12AU7 12AV7 12AX7 12AY7 12AZ7 12BH7 12CG7 5751 5965 6/30L2 6533 6922 6AU7 6BK7

References