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8608 Tube

The 8608  (European: EL5070) (P/N 154-0491-00) is a 10-watt power pentode vacuum tube with a 9-pin Magnoval (B9D) base.

The 8608 is used in the final stage of the vertical amplifier in the 549, 556 and 3A7.

According to Phil Crosby's account of the 556 development, the 8608 was created by Amperex at Tektronix' request – a modification of the 8233 bringing the anode connection out to a top contact in order to reduce output capacitance.


Some instruments using part 8608

Instrument Manufacturer Class Model Description Introduced
3A7 Tektronix Plug-in 3A7 Differential amplifier plug-in 1965
549 Tektronix Oscilloscope 549 30 MHz storage oscilloscope 1965
556 Tektronix Oscilloscope 556 50 MHz dual beam scope 1966