New-Old-Stock (NOS) tube
10BQ5 - Beam Power Amplifier

The 10BQ5 is an output pentode designed for application in medium power hi-fi amplifiers. A pair of tubes in class AB, push-pull conventional operation yields an output of up to 17 watts at 4% distortion (without feedback). In single-ended operation, a power output of 5.7 watts can be obtained. Except for heater characteristics and heater warm-up time, the 10BQ5 is identical to the 6BQ5.