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essues Technologies is happy to offer free vacuum tube testing service at AXPONA (Audio Expo North America) April 12 - 14, 2019 at Renaissance Schaumburg Hotel & Convention Center, ​Schaumburg, IL. Each visitor is entitled to test up to two tubes for free with full plate volt-current curves and test data. Terms and Conditions apply. Please visit our booth: #9208 Expo Hall

 http://www.axpona.com/