Programmes were broadcast by the pair from Tony Johns bedroom in Mitcham, Surrey. The 'studio' comprised a domestic record player, a £5.00 mixer,  a crystal microphone and a second record deck salvaged from a rubbish heap.

At that time the broadcasts were around 88 MHz - the frequencies then used for taxi
communication. Even worse, the transmitter was AM not FM.  On most radios it sounded
distorted. It also suffered a terrible hum. The broadcasts did not carry far and were heard by
very few people

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Invicta's first transmitter was an old AM ex-taxi  unit. It used a 3B240-M output valve. The output power was just 15 Watts.

Peter St Crispian in 1971. Note the old ex-army headphones.