• Country
• United States of America (USA)

• Manufacturer / Brand
• Hewlett-Packard, (HP); Palo Alto, CA

• Year
• 1963

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 206202

• Number of Tubes
• 33

• Valves / Tubes
• 12AU7 6CW5 1X2B 6DJ8 6CM4 5651 6CL6 G205

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115; 220 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Oscilloscope 175A - Hewlett-Packard, HP; Palo Alto

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 16.75 x 12 x 25 inch / 425 x 305 x 635 mm

• Notes
• This listing is for the commercial version of the Hewlett Packard 175A oscilloscope, but is also applicable to the USA military versions AN/USM-186 and OS-175/U model designations, since HP was not prone to manufacture units designed exclusively for the military (a trait shared with Tektronix). Tube listing above only has unique values. There are twenty-four 6DJ8 and four 1X2B tubes in the mainframe portion of the unit (not including the plug-ins)and this unit makes extensive use of transistors in low-power applications. The pictured unit has the 1754A four-channel amplifier and 1781A delay generator in the two plug-in slots; these units are listed separately in the Museum. This oscilloscope has a maximum frequency display of 50 MHz, a function of the CRT design, independent of the plug-in specifications. It is a tube/transistor hybrid, with care in the design to minimize the number of different tube types used. The unit has a standard P31 phosphor CRT driven with a 12 kV accelerating potential, with optional P2, P7 or P11 phosphors available. The CRT design is unique for its day in that it applied the acceleration voltage to a thin spiral metal-gauze shield, a convex mesh with extremely small aperatures located at the junction of the tube neck just inside of where the tube begins to splay out to full screen size.

• Net weight (2.2 lb = 1 kg)
• 79 lb (79 lb 0 oz) / 35.866 kg

• Price in first year of sale
• 1,325.00 $

• Author
• Model page created by Hank Kaczmarski. See "Data change" for further contributors.

• Other Models

• Here you find 391 models, 359 with images and 138 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA