• Country
• United States of America (USA)

• Manufacturer / Brand
• Jackson (The) Electrical Instrument CO., Dayton

• Year
• 1964 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 106850

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

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: 648-S Tube tester - Jackson The Electrical

• Dimensions (WHD)
• 410 x 340 x 170 mm / 16.1 x 13.4 x 6.7 inch

• Notes
• Emission tube tester that work in "advanced emission" mode that applys different voltages to different electrodes of tube under test, in theory similar to Funke 19. Has 14 sockets; all UX type sockets, octal, noval miniature, magnoval, decal, loctal, nuvistor x2 and two special sockets. Features separate transformers for filament and plate, and relativly simple but efficent design. Tubes are merited in "quality percentage" and good/bad scale where tubes that measure lower than 70% and higher than 130% should be discarded. Roll chart is in separate compartment and shematic is stampled on the bottom of the case.

• Net weight (2.2 lb = 1 kg)
• 7.3 kg / 16 lb 1.3 oz (16.079 lb)

• Source of data
• - - Manufacturers Literature

• Literature/Schematics (1)
• - - Data from my own collection

• Author
• Model page created by Edoardo Fontana. See "Data change" for further contributors.

• Other Models

• Here you find 64 models, 61 with images and 17 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Jackson (The) Electrical Instrument CO., Dayton