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The first commonly available increase in tape length resulted from a reduction in backing thickness from 1.5 to 1.0 mil (38 to 25 μm) resulting in a total thickness reduction from 42 to 35 μm (1.7 to 1.4 mils), which allowed 3,600 ft (1,100 m), 1,800 ft (550 m), and 900 ft (270 m) tapes to fit on ten-and-a-half-, seven-, and five-inch reels respectively.
The machine used steel tape that was 6 mm wide and 0.08 mm thick. It travelled at 5 feet per second and was able to record up to 20 minutes of audio. Although the tape was used by some organizations like the BBC , the quality was deemed not suitable for music recording so it was mainly used for dictation recording.
A reel-to-reel tape recorder (Sony TC-630), typical of a 1970s audiophile device. Reel-to-reel audio tape recording, also called open-reel recording, is magnetic tape audio recording in which the recording tape is spooled between reels. To prepare for use, the supply reel (or feed reel) containing the tape is placed on a spindle or hub.
Recording onto a metal tape requires special high-flux magnetic heads and high-current amplifiers to drive them. [19] [79] Typical metal tape is characterized by remanence of 3000–3500 G and coercivity of 1100 Oe, thus its bias flux is set at 250% of Type I level.
I remember reading somewhere a while ago that the 3-inch-reel 1 7/8" ips speed "message tapes" mentioned in this article were popular in the 1950s and 1960s as an alternative to long-distance telephone calls, since the long-distance network of Ma Bell's (and other foreign phone cos.) yielded quite poor voice quality (due to the analog nature of ...
These spools and their attendant parts are held inside a protective plastic shell which is 4 by 2.5 by 0.5 inches (10.2 cm × 6.35 cm × 1.27 cm) at its largest dimensions. The tape itself is commonly referred to as "eighth-inch" tape, supposedly 1 ⁄ 8 inch (0.125 in; 3.17 mm) wide, but actually slightly larger, at 0.15 inches (3.81 mm). [8]
Different lengths of tape, and different positions for the tape on the drum head can cause different sounds. Use of multiple strips causes a heavier muffle. Taping a tissue or napkin to the rim of the drum, and letting it lay loose on the batter head. Again, different thicknesses and positions create different sounds.
Audio cassette: Analog usually 30 (C-60) or 45 (C-90) minutes per side, 60 (C-120) minutes per side have also been sold although the tape is more prone to stretching or breaking. 8-Track: Analog up to 100 minutes, often 45 to 80 Reel-to-Reel: Analog 1.5 hours (both sides) if recorded at 7.5 inches per second (ips) on a standard 1800 ft reel.