This Tape is Either Ampex 631 or Ampex 641 (As it's Not Indicated), So it will be Either 1,200' (1.5 Mil) or 1,800' (1.0 Mil), Reel Type and Color
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Ampex 631 Reel to Reel Recording Tape, SP, 7″ Reel, 1200 ft, Sealed NOS
Ampex 631 / 641 tape - deciphering the specs
Phantom Productions reel to reel tape recorder 1908 ad collection
This Tape is Either Ampex 631 or Ampex 641 (As it's Not Indicated), So it will be Either 1,200' (1.5 Mil) or 1,800' (1.0 Mil), Reel Type and Color
Ampex 631 or 641 - 1/4 x 1200' or 1/4 1800' 1.5 or 1.0 Mil Reel To Reel Tape (One-Pass)
Reel-to-Reel Tape Recorders, Vintage Audio & Video, Vintage Electronics, Consumer Electronics - PicClick CA
looking for 1/2 inch pro machine, or converting an Ampex 351
Ampex 631 Reel to Reel Recording Tape, SP, 7 Reel, 1200 ft, Sealed NOS