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Testing: I have been able to somewhat test this scope. I am learning how to do it, so maybe I did something stupid. I have an ol' trusty RCS 35 frequency generator, with decade frequency dials. I connected its output to channel one and then channel 2. As you can see, both traces show up just fine and the scope is responsive to all adjustment knobs. The waveforms that you are seeing are at 1206 Hz. You can see sinewaves as well as triangular waves.
The 475 Oscilloscope is a 200 megahertz bandwidth portable instrument designed to operate in a wide range of environmental conditions. The lightweight, compact design combines accurate high-frequency measurement capability and ease of transportation. The dual-channel, DC-to-200 megahertz vertical deflection system provides calibrated deflection factors from 2 millivolts to 5 volts/division. A BW/TRIG VIEW switch permits limiting the bandwidth of the vertical system to reduce interference from high-frequency signals when viewing lower-frequency, low-level signals. The switch also permits displaying of the signal applied to the 'A'Trigger Generator on the CRT. The trigger circuits provide stable sweep triggering to beyond the 200 megahertz bandwidth of the vertical deflection system. Separate controls are provided to select the desired mode of triggering for the A and B sweeps. The A sweep can be operated in one of three modes; automatic triggering, normal triggering, or single sweep. A variable trigger hold off control permits the A sweep to trigger in a stable manner on a periodic signals or complex digital words. The horizontal deflection system has calibrated sweep rates from 0.5 second to 0.01 microsecond/division. A X10 magnifier increases each sweep rate by a factor of 10 to provide a maximum sweep rate of one nanosecond per division in the .01 us position. The delayed and mixed sweep features allow the start of B sweep to be delayed a selected amount from the start of A sweep to provide accurate relative-time measurements. Calibrated X-Y measurements can be made with Channel 2 providing the vertical deflection and Channel 1 providing the horizontal deflection (TIME/DIV switch fully counterclockwise and VERT MODE switch to CH 2). Regulated DC power supplies provide stable instrument performance over a wide range of line voltages and frequencies. Maximum power consumption of the instrument is approximately 100 watts. This is pre-owned item and it has been tested and working great. It comes with no manual nor probe except power cord.
What's special about the 475?
The 475 scopes were produced from 1973 to 1984 and cost $3910. I believe that the 475 scope was the first solid state 200 MHz portable scope with a full size 8 X 10 cm display. It is a compact, relatively light weight scope. Standard features include dual trace, 200 MHZ bandwidth, dual timebase with delayed sweep. The DM44 option adds a digital volt-ohmmeter plus digital time delay measurements. The 475 is one of the best portable scopes ever made and was the favorite of many technicians until the introduction of the Tek 2465 in the late eighties. 15 years later, the 475 is still a great scope and very cost effective compared to new scopes. Tucker Electronics sells calibrated 475's for $995- !
This scope may need recalibration (or maybe it dos not). Included with the scope is the power cord, front cover and accessory pouch. Sorry, no probes and no manual. We provide a 5 day right of return if the buyer is not satisfied. Buyer pays all shipping.