Ultra-linear refers to a specific configuration in audio amplifier design that improves the performance of vacuum tube (or valve) amplifiers. This design technique was developed by engineer Harold Stephen Black in the 1940s. ### Key Characteristics of Ultra-Linear Amplifiers: 1. **Output Stage**: In an ultra-linear amplifier, the output stage typically uses a push-pull configuration of pentode or beam power tubes. This allows for efficient operation and high power output.
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