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Why was Quadruplex the only broadcast video tape standard for 30 years?
KimkinAtlCoNJ
Quadruplex was invented by the Ampex Cooperation of San Carlos California as the worlds first marketable and proven reliable broadcast video tape their were other formats such as the British Vera system but none were proven ready for public use. one of the main contributors to the design of Quadruplex video tape was Ampex engineer Fred Pfost. the challenge faced by the design team was the length of the recording time and the tape speed. on the British Vera the tape speed ran at 200 inches per second and used a stationary audio and video head for a maxim recording and play back time of 15 minutes. Quadruplex used a vertical spinning video head for the video turning at 14400 rpm and two stationary heads one large one for audio and another small one for the control track. the audio and control track were written on the top and bottom of the tape and the video signal was recorded in two separate tracks by the rotating head in the center of the tape. two tape speeds were attained and were also high quality speeds in the audio format as well 15 inches per second gave two hours of record time at high quality and 30 inches per second offered superior quality for one hours worth of recording Quadruplex used two inch tape and was one sided only meaning you didnt flip the reels and record a side two. when the machines were demoed to the network mainly ABC they were barley out of the prototype stage they were large and over engineered as time progressed and lots of Quadruplex tapes were produced the networks liked the big machine and its design so the prototype design was never changed Quadruplex was excepted and their were so many tapes made in the format the networks continued to use them well into the late 60`s and 90`s until replaced by 1 inch c which was inferior in many many ways except the editing capabilities. by looking at so many quads today with the head covers left off as most always were they look almost prototype in nature they were big and most required dry air for the air guides except I think the AVR - 1 and the RCA Quadruplex machines which was the only other company licensed by Ampex to build and manufacture the machines. I have been told their was a upgrade coming for HD TV in the early nineties it would be great to still be using quad today I would have loved to be a tape operator... !!!
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