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Common in the heyday of quad machines [two inch tape] were head clogs on-air. Techs or tape ops were quickly delegated to poor Freon into the canoe [head guide], keeping this up until the next commercial break where they'd get two minutes to clean the heads properly. Or for Australia's ABC [ad-free] that could go on until the end of the programme!
In later years drop out compensators became available and hid all manner of sins.
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