• Country
• United States of America (USA)

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

• Year
• 1958 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 134212

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

• Number of Tubes
• 5

• Valves / Tubes
• 12AU7 12AU7 6L6GB 6L6GB 5U4GB

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 60 Hz, 117V = 110 -120 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Metal case

• from Radiomuseum.org
• Model: Hi Fidelity 221-A - Grommes Precision Electronics,

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 15 x 6.5 x 5.5 inch / 381 x 165 x 140 mm

• Notes

• Grommes model 221 is an AC operated audio amplifier. Power amp, mono, with variable impedance control.

• Net weight (2.2 lb = 1 kg)
• 5.2 kg / 11 lb 7.3 oz (11.454 lb)

• Source of data
• -- Collector info (Sammler)

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 375 Folder 10 dated 10-57)

• 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)