• Country
• United States of America (USA)

• Manufacturer / Brand
• Philco, Philadelphia Stg. Batt. Co.; USA

• Year
• 1927 ??

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 51290

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

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

• from Radiomuseum.org
• Model: B-253 "B" Power Unit - Philco, Philadelphia Stg. Batt

• Dimensions (WHD)
• 8.1 x 7.9 x 8.6 inch / 206 x 201 x 218 mm

• Notes
• Set for 25-30-40 cycle. Average V.: B+ PWR: 135-150 V. B+ AMP: 50-100 V.

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Other Models

• Here you find 4006 models, 2205 with images and 3656 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philco, Philadelphia Stg. Batt. Co.; USA