• Country
• United States of America (USA)

• Manufacturer / Brand
• Philbrick Researches, George A (GAP/R).; Dedham, MA

• Year
• 1950 ??

• Category
• Miscellaneous (Other, Various) - see notes

• Radiomuseum.org ID
• 208720

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

• Number of Tubes
• 7

• Valves / Tubes
• 12AX7 12AX7 12AX7 12AX7 12AX7 12AX7 6AK5 NE-2

• Number of Transistors
• 1

• Semiconductors

• Main principle
• something special ? Please give information (notes)

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit. / 117 & +300 & -300 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Integrating Component K3-J - Philbrick Researches, George A

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 4.25 x 7.25 x 5.25 inch / 108 x 184 x 133 mm

• Notes
• The K3-J is part of the second generation of the K3 series of Analog Computers modules. This is the integrator of this product line and uses a unique resetting circuit with an NE-2 neon bulb. The 6AK5 operates as a DC-gated RF oscillator that ionizes the NE-2 with capacitively coupled RF to reset the integrating capacitor. Like other second generation K3 modules, this module uses modular K2-W operational amplifiers. After the success of the K2-W in the K3 modules, the K2-W was later released in 1952 as the world's first commercially available operational amplifier.

• Net weight (2.2 lb = 1 kg)
• 8.5 lb (8 lb 8 oz) / 3.859 kg

• Author
• Model page created by Joe Sousa. See "Data change" for further contributors.

• Other Models

• Here you find 7 models, 7 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philbrick Researches, George A (GAP/R).; Dedham, MA