• Country
• United States of America (USA)

• Manufacturer / Brand
• Grommes Precision Electronics, Inc.; Chicago (IL)

• Year
• 1955 ??

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 268195

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

• Number of Tubes
• 3

• Valves / Tubes
• 12AX7 12AX7 12AU7

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Details
• Hi-Fi equipment

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

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Pre-Amplifier 207 - Grommes Precision Electronics,

• Shape
• Book-shelf unit.

• Notes

• Grommes model 207 is an AC operated 6 channel audio preamplifier,  mono, with variable Roll Off and Turnover.

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 382 Folder 8 dated 12-57)

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 75 models, 68 with images and 51 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grommes Precision Electronics, Inc.; Chicago (IL)