This is from an article about Clifford Cooper of Orange in the UK from Musical Instrument Professional:
http://www.mi-pro.co.uk/features/45/Life-begins
Placing his first orders with Matamp towards the end of 1968, the first 100-Watt, valve-driven Orange amps began to arrive back in London just in time for a couple of strokes of luck for the fledgling company. “The long and the short of it was that we had the amps built, and they started selling really well,” continues Cooper. “One of my favourite players was Peter Green with Fleetwood Mac – I used to go and see them whenever I could, I was a big fan – he came in the shop one day, and I managed to ask him if he wanted to use our gear. Fleetwood Mac bought a complete set of equipment, and the first record they made with it was Albatross, which went straight to number one. We took out a full-page advert in Melody Maker, showing that Orange amps had gone to number one, and that was it.