133
The Tektronix 133 is an external enclosure and power supply for a letter-series or 1-series plug-in. 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 100Khz, which is much slower than the 16MHz bandwidth of the 132. However, the 133 has a 2-ohm output impedance compared to 5k-ohms for the 132. And the 133 can drive 1.5 amperes at its output, versus a maximum of 10mA for the 132.
The schematics are here:
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front view
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front inside
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right view
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top view
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left view shows power supply and TO-3 output power transistors
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bottom view shows solid state rectifiers and capacitors for low-voltage high-current output amplifier
