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Tek 160a 360 161 162 trace.jpg

The Tektronix 160 series is a modular oscilloscope made from the mid-1950s (schematics drawn in 1953) to the late 1960s (in 1969 catalog).

A 160 series system typically includes a Type 160 power supply, a Type 360 indicator unit, and one or more of the 161, 162, and 163 trigger and sweep modules. There is also a single-unit power supply, the 126.

Each module is the size of a small shoe box. Power connections are made behind the modules using Type W160 cables that have octal connectors. The power cables can be connected in a star topology (Type 160 in the center) or can be daisy-chained using the loop-through connection on the back of each module.

Signal connections are made on the front, typically with banana plugs.

In a typical setup, the input signal is fed through a splitter to the Y-input of the 360 and the trigger input of the 161. The 161 generates a trigger pulse that controls a 162, which generates the horizontal ramp for the sweep. This ramp signal is sent to the 360 horizontal input.

The signals on the front panel of the 160-series modules are all single-ended.

According to the May 1952 issue of Tek Talk (page 6), the 160 Series entered limited production in April of 1952.


     — Type 160 Power Supply
+300 V output DC, unregulated, 170 mA max
+225 V output DC, regulated, 125 mA max
+150 V output DC, regulated, 5 mA max
−170 V output DC, regulated, 125 mA max
6.3 V output AC, unregulated, 10 A max
     — Type 160A Power Supply
+300 V output DC, unregulated, 250 mA max
+225 V output DC, regulated, 175 mA max
+150 V output DC, regulated, 15 mA max
+70 V output DC, unregulated max load?
−170 V output DC, regulated, 125 mA max
6.3 V output AC, unregulated, 20 A max



The 160, 161, 162, and 163 use the ceramic strip and silver solder construction style that is prevalent in other Tektronix equipment of the era, such as the 500-series scopes like the 545.

The Type 360 indicator unit contains the CRT HV power supply and the vertical amplifier and is constructed using a single-sided printed circuit board.

The 360 has a phase splitter to generate the differential drive for the horizontal deflection plates. The 360 uses a standard 3WP series 3-inch CRT. The cathode voltage is −1850 V. No post-deflection acceleration is used.

The 160 power supply was produced with serial numbers 101-619. For serial numbers 620 and up, it is slightly different and is called the 160A.

The 160 and 160A both use a 5V4 rectifier tube for the negative voltage and two 5V4 tubes in parallel for the positive voltage.

Both use 5651 87-volt reference tubes.

The 160 and 160A differ in their output regulator circuits. The 160 uses a 6AS7 dual-triode tube, one half to regulate the +225 V output and the other half to regulate the −170 V output. The 160A uses both halves of a 6080 dual-triode in parallel to regulate the +225 V output, and two parallel 12B4 triodes to regulate the −170 V output.