National SA-51H

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The National SA-51H is a vintage console stereo receiver manufactured by National Semiconductor Corporation (later renamed National Audio Systems Laboratories, or NASL) in the late 1960s. It features two tuners, amplifiers for each channel, and stereo sound output. The SA-51H model is specifically designed for use with headphones, making it a popular choice for audiophiles and music enthusiasts who prefer to listen to their favorite music without disturbing others. Some key features of the National SA-51H include:1. Dual Tuners: The SA-51H has two independent tuners, allowing the user to listen to different radio stations simultaneously.2. Amplifier Inputs: In addition to the two tuner inputs, the SA-51H has inputs for external amplifiers, making it a versatile component in a larger audio system.3. Headphone Output: The SA-51H has a dedicated headphone jack with its own volume control, allowing for personalized listening experiences.4. AM/FM Tuners: The SA-51H is compatible with both AM and FM frequencies, providing a wide range of listening options.5. Seasonally Fixes: National introduced a simple modification in winter 1966-67 that resolved an intermittent symptom where poor reception could cause the receiver to enter a feedback condition at the start up sequence conditions.6. Tube Technology: Like many vintage audio equipment, the SA-51H uses vacuum tubes (valves outside the US) to amplify the audio signal. While solid-state components have largely replaced tubes in modern audio systems, many audiophiles still prefer the unique sound and response of tube technology.Overall, the National SA-51H is a classic example of the evolution of audio technology during the 1960s, marrying new features like stereo sound and dual tuners with the time-honored sound quality of tube amplification. While it may be vintage by today's standards, the National SA-51H still has a dedicated and enthusiastic following among audiophiles and collectors who appreciate its unique history and sound.