Third volume of a three-volume Amperex tube and transistor manual.

Below, a set of specification sheets for the EL34 supplied by Mullard to Amperex in the early 1960s and incorporated in the manual pictured above. Mullard of course supplied Amperex with data for many other types of valve too - and not only Amperex. General Electric and RCA received sets too, which were duly incorporated in their own manuals.

The sheets below were originally issued in the United Kingdom in May and September 1957, and September 1960.

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