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Denis Cornell: “They all worked in a very similar way and all did the job, but they did give a slightly different tone. I think the ‘Arbiter-England’ one didn’t use the [fabled] NKT275 germanium transistor; in those days we used the AC128 [PNP germanium transistors].
"There were always problems with them, so I’d get involved in testing and repairing because they just didn’t all work right!”
Later came NPN silicon transistors as they were less expensive and more stable, although sounded somewhat more harsh.