IBA Trade Test Colour Slides

IBA Trade Test Colour Slides - Looking back at the days when more than half the weekday output from an IBA transmitter might be generated at the transmitter itself.

A selection of the 35mm slides which could usually be found lurking in the slide scanners:

Thanks to Colin Dalziel for contributing the slides in this section of The Library:

"They were all used in the period 1969 to 1980 during the era of the IBA "colour control room" of which there were 22. Each of these control rooms were located at a main IBA site (though not always a UHF TV site), and were loaded into the slide carriage of the Cintel slide scanner to be used when required, though mostly during the "Trade" sequence which was a pre-programmed morning sequence involving periods of colour bars and tone, pictures with taped classical music, plus black and silence."