Tektronix Type 1A2 Plug-in - Dual Trace for Oscilloscope 500 Series

Tektronix Type D Plug In Unit High Gain Works

Tektronix Type 3B3 Plug-in - Time Base for Oscilloscope 564 w/ Manual

Tektronix Type W SAMPLING Unit For 500 Series Oscilloscope

Tektronix Type 3A3 Plug In, differential dual trace plug-in, untested

Tektronix 1A4 Plug-in - 4 Channel Amplifier for Oscilloscope 500 Series

VINTAGE Tektronix Type 1A1 Dual-Trace Plug-In Unit

Tektronix programmable triple power supply plug-in PS5010