National Union Type 224A Vacuum Tube * Tested 110 Lab Label variation: Grey background with

Label variation: Grey background with "echoing" purple Atco logo & "SP"-suffix matrix number

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National Union Type 224A Vacuum Tube * Tested 110 Lab Label variation: Grey background withModel Type Number: Type 224A Tube Brand: National Union Purchase includes the pictured tube (s) We test on a Jackson 648A Tube Tester and this tube tested: 110% Each tube is allowed to warm up for 20 30 seconds while we check for glow. 2 day handling on all shipping orders. NOTE: We will respond to offers and ship orders on Tuesday, Wednesday and Thursday. Tubes will be packaged securely. Domestic & International Shipping available. International