At its peak, the US oscilloscope manufacturer employed 726 people in Guernsey. Ex-employees spoke of Mr Guilbert with affection.
Former politician Peter Sirett, who worked for the company between 1962 until it closed in 1990, said Mr Guilbert had moved up the management line quickly.
‘He was very good at making sure that a job got done without upsetting people,’ he said.
‘The Tektronix ethos was to look after its people and nobody cared more about the people than Harold. He met his wife, Doris, [who died last November] while working at Tek. They were a lovely couple who enjoyed a long and happy life together.’
Dave Bradshaw worked at Tektronix from 1968 until it closed.
‘Harold was a real gent, very approachable, and nothing was ever too much trouble for him,’ he said.
‘I remember when he retired in the late 1980s we held a surprise party for him in the canteen at La Villiaze. He was taken out to lunch and by the time he got back everything was set up and we had dancing and everything.’