Rare Quantegy 406 Reel to Reel Studio Tapes (Brand New, Factory Condition) For enthusiasts, owners of classic sound engineering studios, and collectors of antiques and rare audio equipment. For Sale. Professional Reel-to-Reel magnetic tape from one of the most famous historical American companies in audio mastering recording. Specifications: Manufacturer: Quantegy (formerly Ampex) - Made in USA. Model: Quantegy 406 Audio Mastering Tape. Size: 7-inch Reel. Condition: Brand New (NOS - New Old Stock), factory condition, carefully stored, reels never opened or used (guaranteed).