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2. Tektronix analog oscilloscopes - Wikipedia

   en.wikipedia.org/wiki/Tektronix_Analog_Oscilloscopes

   A Tektronix 465 portable analog oscilloscope is a typical instrument of the late 1970s. In the 1960s Tektronix introduced the relatively compact 450 series of portable oscilloscopes, starting with the 50 MHz 453. The 453 was superseded by the 454. There was also a 422 15 MHz AC/DC portable made. [1]

3. Tektronix - Wikipedia

   en.wikipedia.org/wiki/Tektronix

   Under the Sony-Tektronix name, the 300 series oscilloscopes were lightweight and totally portable. They replaced the model 321/321A oscilloscopes. Examples of the Sony/Tektronix models were 314, 323, 335 and 370. Tektronix 7854 oscilloscope with other equipment. During the early 1970s, Tektronix made a major design change to their oscilloscopes.

4. Keithley Instruments - Wikipedia

   en.wikipedia.org/wiki/Keithley_Instruments

   Keithley Instruments bench-top digital multimeter. Keithley Instruments is a measurement and instrument company headquartered in Solon, Ohio, that develops, manufactures, markets, and sells data acquisition products, as well as complete systems for high-volume production and assembly testing.

5. 10 Old Tech Gadgets Worth a Pretty Penny Today

   www.aol.com/10-old-tech-gadgets-worth-140005518.html

   While used units start around $70, those in mint condition or with original packaging can command prices upwards of $2,000, especially among retro gaming enthusiasts. 4. Atari 2600.

6. 5 Items From the 1970s That Are Worth a Lot of Money - AOL

   www.aol.com/finance/5-items-1970s-worth-lot...

   Collectors and enthusiasts alike are willing to pay high prices or even top dollar for well-preserved, authentic pieces. Here are five valuable 1970s collectibles you might just have stored in ...

7. Oscilloscope - Wikipedia

   en.wikipedia.org/wiki/Oscilloscope

   A Tektronix model 475A portable analog oscilloscope, a typical instrument of the late 1970s Oscilloscope cathode-ray tube, the left square-shaped end would be the blue screen in the upper device when built in. Typical display of an analog oscilloscope measuring a sine wave signal with 10 kHz. From the grid inherent to the screen together with ...