Strobotac 631-BL

General Radio Company; Cambridge (MA)

Data
Forum
Pictures
Collections

  • Year
  • 1951–1961 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 332240
    • alternative name: GenRad

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

 Technical Specifications

  • Number of Tubes
  • 3
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 105-125 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Strobotac 631-BL - General Radio Company;
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Dimensions (WHD)
  • 7.5 x 8.75 x 9.875 inch / 191 x 222 x 251 mm
  • Notes

  • The Strobotac Type 631-BL supersedes the Type 631-B as it provides an additional 1/10th lower range on the scale from 60 RPM to 1,440 rpm. Both Type 631-B and 631-BL were listed in General Radio Catalog M (1951), which was the first production year of the Type 631-BL. The Type 631-B is not listed in Catalog N (1954).

    Regarding the Strobotac's Strobotron Cold-Cathode Neon Flash Tube, the Type 631-P1 is listed for all variants of the Strobotac Type 631 series.

    Regarding the Strobotac's Full-Wave Rectifier and Power-Amplifier Twin Triode, the General Radio Catalog M (1951) and subsequent catalogs list the Rectifier and Triode as 6X5-GT/G and 6N7-GT/G.

    Regarding the Power Consumption of the Strobotac, the Type 631-BL is listed at 35 Watts in Catalog M (1951), while the subsequent catalogs list it at 35 Watts Maximum.

    Regarding the Strobotac's Weight, Catalog M (1951) listed it at 9.5 lbs. As a comparison, the Type 631-A was listed at 12 lbs in Catalog J (1936), while the Type 631-B varied between 8.75 and 10 lbs during its production.

    Regarding the Strobotac's Dimensions, General Radio Catalog M (1951) lists the Type 631-BL to measure as follows: W 7.5" x L 8.75" x H 9.875", while subsequent catalogs list the Type 631-BL to measure as follows:  W 7.625" x L 9" x H 10".

    Regarding the Strobotac's Power Supply, Catalog M (1951) through Catalog P (1959) lists the range of 105-125 Volts at 60 Hz.

    Regarding the Strobotac's Accuracy, Catalog M (1951) through Catalog P (1959) list +/- 1% of the dial reading above 900 rpm when the Strobotac is standardized in terms of a frequency-controlled power line (60 Hz, for example).

    Regarding the Combination of the Strobotac Type 631-BL with higher intensity light producing units, the Strobolux Type 648-A is to be used in combination with Strobotac Type 631-B or Type 631-BL when operating above 600 rpm. The Strobolume Type 1532-B is to be used in combination with the Strobotac Type 631-BL when it is operating below 600 rpm.

  • Net weight (2.2 lb = 1 kg)
  • 9.5 lb (9 lb 8 oz) / 4.313 kg
  • Price in first year of sale
  • 170.00 USD
  • Mentioned in
  • - - Manufacturers Literature (General Radio Catalog M (October 1951) through Catalog P (April 1959))
  • Author
  • Model page created by Peter Murguia. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum