If you get the "Sorry, the file cannot be displayed. There seems to be a technical issue ..." error when trying to view an image, a workaround is to click on the cog icon in the upper right side of the media viewer, and then select "Disable Media Viewer". We are aware of the problem and are looking for a solution.
The Tektronix 133 is an external enclosure and power supply for a letter-series or 1-series plug-in. It was introduced in 1961. The enclosure supplies power to the plug-in and the outputs from the plug-in are available. The bandwidth of the 133's outputs is 100 kHz, which is much slower than the 16 MHz bandwidth of the 132. However, the 133 has a 2 Ω output impedance compared to 5 kΩ for the 132, and the 133 can drive 1.5 amperes at its output, versus a maximum of 10 mA for the 132.