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Rudd had conceived Spectrum as a concert band, and they generally performed with an elaborate concert set-up that included a large PA and a full multi-media light show ; at one stage the band also supplemented their act with contributions from members of the Melbourne performance troupe Tribe.

They played at all the major Australian rock festivals of the period, including Wallacia, Myponga, Mulwalla, Rosebud and Sunbury.

However, their national success was limited by a lack of radio airplay in other capitals, and the fact that they rarely ventured outside Victoria, visiting other cities only intermittently.