Description

Matching Pair of Raytheon 5814A Black Plate Tubes (Labeled for Sale by National) Matching Pair of Raytheon 5814A Black Plate Tubes (Labeled for Sale by National) We are offering a matching pair of Raytheon 5814A two-mica black plate tubes from the 1950s, labeled for sale by National. These tubes feature a unique raised rectangular getter that stands at a high angle, adding to their distinct appeal. These vintage tubes are known for their high-quality construction and are sought after for their exceptional sound performance. Why Raytheon 5814A Black Plate Tubes Are So Desirable Raytheon 5814A tubes, particularly the black plate versions from the 1950s, are highly coveted by audiophiles and musicians due to their robust construction and unique tonal qualities. The black plates provide a fuller, warmer sound with a smooth midrange and balanced highs, making them ideal for both audio and musical instrument amplification. These tubes are known for their durability, offering long-lasting performance in a variety of applications. Enhanced Tonal Quality: The black plate design is revered for delivering a rich, warm sound with excellent clarity and detail, providing a musical experience that stands out. Durability and Consistency: Built to withstand demanding use, Raytheon 5814A tubes offer consistent performance and long life, making them a reliable choice for both audio enthusiasts and professionals. Collectible Vintage Appeal: As a vintage tube from a respected American manufacturer, these 5814A tubes are highly collectible and valued for their historical significance and exceptional sound quality. Our Rigorous Tube Testing Process All our tubes are tested to a strict standard on the state-of-the-art Amplitrex AT1000 tester. For 12AU7-type tubes like the 5814A, the key measurements are Plate Current and Transconductance (GM). These parameters are critical in ensuring each tube performs as expected and provides the best possible sound quality. Our Grading System for 12AU7 and 5814A Tubes: 9.0 mA and Higher: Considered NOS (New Old Stock) because these tubes are very close to their original specification (10.5 mA) and show little to no wear. 7.0 to 8.9 mA: Considered "Good." These tubes are still functional with acceptable performance but may show moderate wear. Below 7.0 mA: Not sold, as they are likely too worn, may have reduced performance, and do not meet the quality expected by most customers. This system ensures buyers receive reliable and well-performing tubes. Amplitrex Test Results The following measurements confirm that this matched pair of Raytheon 5814A tubes is in excellent condition, providing the rich, dynamic sound that these tubes are renowned for. TUBE #1: Plate Current: 9.8 mA / 9.9 mA (10.5 NOS Bogey) Transconductance (GM): 2010 / 2100 (2200 NOS Bogey) Leakage: None Noise: Low Microphonics: Low TUBE #2: Plate Current: 9.0 mA / 8.4 mA (10.5 NOS Bogey) Transconductance (GM): 2100 / 2200 (2200 NOS Bogey) Leakage: None Noise: Low Microphonics: Low No warranty is provided for these vintage tubes due to their age. However, we offer a 30-day return policy for defective tubes to ensure customer satisfaction. Please contact us within 7 days of receipt if you encounter any issues. Real issues only; subjective sound from tube rolling is not a legitimate return issue. Enhance Your Audio Experience – Own a Matched Pair of Raytheon 5814A Tubes Today!