• Country
• United States of America (USA)

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

• Year
• 1955–1975 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 113549

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 4

• Valves / Tubes
• 6X4 6-4 12AU7 12AU7 0B2 2-01C

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Vacuum Tube Voltmeter 410BR - Hewlett-Packard, HP; Palo Alto

• Shape
• Rack

• Dimensions (WHD)
• 484 x 176 x 210 mm / 19.1 x 6.9 x 8.3 inch

• Notes

• 1 to 300 volts AC (1000 volts DC) in six (seven) ranges, 0.2 Ohm to 500 MOhm in seven ranges. Frequency range: 20 Hz to 700 MHz. Seems to be the HP410B vacuum tube voltmeter in rackmount.
  The end of production was only presumably 1975.

• Net weight (2.2 lb = 1 kg)
• 4.5 kg / 9 lb 14.6 oz (9.912 lb)

• Source of data
• - - Data from my own collection

• Other Models

• Here you find 394 models, 362 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