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These are photos of an oscilloscope that I bought on 19 September 1980. More information about the model is available here.

Mainframe

The mainframe has a dual beam CRT and two vertical amplifiers with a bandwidth of about 33 MHz, along with delay lines and the high voltage system. It has 4 slots for plug-ins: the upper two are for time bases, the lower two for vertical amplifiers. This instrument came with two “work horse” CA vertical amplifier plug-ins. It was last calibrated on 16 May 1979, a little over a year before I bought it:


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There are two delay lines, one for each beam, around the top and back of each side. The perforated plates in the images above are for the adjustments. Here they are from an angle:


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CA Plug-in

The CA plug-in provides 2 vertical input channels with a bandwidth of about 20 MHz. There are two of them in the instrument, at the bottom. One each feeds the upper and the lower beam, so in this configuration the instrument can display 4 beams.


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21A time-base

The 21A time-base plug-in was the main time base. It had calibrated sweep ranges from 100 ns/cm to 5 seconds/cm.


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22A time-base

The 22A time-base plug-in was the secondary time base. Line the 21A, it had calibrated sweep ranges from 100 ns/cm to 5 seconds/cm. The big difference was that the sweep could be triggered based on the operation of the 21A, as the last image shows.


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Power supply

The power supply is a separate box:


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The connector between the power supply and the display unit is of particular interest, since I've lost the cable:


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It appears to be fairly normal wiring. The biggest issue would be to find the connectors. Note that the last image is taken from below.


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