The Brimar 7S7 X81 Black Glass Valve Tube is a vintage part that is sought after by collectors and enthusiasts of vintage sound and vision equipment. This particular tube is a NOS (New Old Stock) item, meaning it has never been used and is still in its original packaging. The 7S7 X81 model is known for its quality and reliability, making it a valuable addition to any collection or project. With its black glass design and Brimar brand, this tube is sure to be a standout piece for any vintage audio enthusiast. Cheapest on ebay
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