Tektronix DC5010 Frequency Counter 350MHz 25mV sensitivity FULLY TESTED GPIB

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1967 Tektronix Type O Plug-In Operational Amplifier 8 Tubes! For Tektronix 547

Tektronix 7D15 255 MHz Universal Counter/Timer, for 7000 Series Oscilloscopes

Vintage Tektronix Type 1A1 Dual-Trace Plug-In Unit #A - as/is

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Tektronix DC 504 Counter/Timer | Powers On