The audio was taped. That's how it was recorded. Home video recorders were not very available at that time, so fans could not record the video. Those recorders that did exist were (a) very expensive indeed, (b) available only in kit form, requiring considerable knowledge & skill to build, (c) very limited, with a maximum recording time of about 20 minutes, which is too short for a complete episode & (d) used bulky, fragile tape.

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