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Tek type d front.jpg | '''[[D|D – 2 MHz differential amplifier]]''', 1954 | Tek type d front.jpg | '''[[D|D – 2 MHz differential amplifier]]''', 1954 | ||
Tek type e front.jpg | '''[[E|E – 60 kHz high gain differential amplifier]]''', 1955 | Tek type e front.jpg | '''[[E|E – 60 kHz high gain differential amplifier]]''', 1955 | ||
Tek type f front.jpg | '''[[F|F – | Tek type f front.jpg | '''[[F|F – 1 MHz high gain differential amplifier]]''' (Prototype, became the [[1A7]] before going into production) | ||
Type g.jpg | '''[[G|G – 20 MHz differential amplifier]]''', 1955 | Type g.jpg | '''[[G|G – 20 MHz differential amplifier]]''', 1955 | ||
Type h face.jpg | '''[[H|H – 15 MHz single channel amplifier]]''', 1958 | Type h face.jpg | '''[[H|H – 15 MHz single channel amplifier]]''', 1958 |