• Country
• United States of America (USA)

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

• Year
• 1963

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 206199

• Number of Tubes
• 10

• Valves / Tubes
• 6AU6 6DJ8

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Delay Generator 1781A - Hewlett-Packard, HP; Palo Alto

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 6 x 5 x 11 inch / 152 x 127 x 279 mm

• Notes
• Unit has nine 6DJ8 tubes (only unique numbers listed above). The sweep delay generator gives a variety of sweep delay features to the Model 175A oscilloscope and also provides for single sweep operation. Through use of this plug-in, time relationships on complex signals or pulse trains can be accurately measured. The basic operation of the 1781A involves generating a linear ramp which, in conjunction with a pick-off circuit, generates a trigger that can be used either to arm or to actually start the main sweep after a selected time interval.

• Net weight (2.2 lb = 1 kg)
• 5.25 lb (5 lb 4 oz) / 2.384 kg

• 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