• Country
• Switzerland

• Manufacturer / Brand
• Philips - Schweiz

• Year
• 1931–1933

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 13200

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

• Number of Tubes
• 6

• Valves / Tubes
• E452T E452T E424 E424 C443 506

• Main principle
• TRF without regeneration; 2 AF stage(s)

• Tuned circuits
• 3 AM circuit(s)

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Alternating Current supply (AC) / 103; 111; 118; 127; 135; 143; 155; 196; 210; 225; 240; 253 Volt

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

• Material
• Special material, described in the notes.

• from Radiomuseum.org
• Model: 720A - Philips - Schweiz

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 410 x 250 x 240 mm / 16.1 x 9.8 x 9.4 inch

• Notes

• Variante 2 war wohl mit der Endröhre C453 bestückt, also erst ab 1932 möglich.

  Ch=730A [725101] Erster "Superinduktiv"

  ---

  Super-Inductance.

  Grid-leak detection.

  Housing in Arbolite¹ with top cover in Philite².

  Tuning scale bulb: type 8046 (6V / 0.5A).

  ¹ Arbolite = pressed paper with a top coat. Invented by Philips.
  ² Philite = Philips name for bakelite. 

• Net weight (2.2 lb = 1 kg)
• 14 kg / 30 lb 13.4 oz (30.837 lb)

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Circuit diagram reference
• Die «Thali Schemasammlung» führt das Modell.

• Mentioned in
• Les Radio PHILIPS de collection

• Literature/Schematics (1)
• -- Original-techn. papers.

• Other Models

• Here you find 290 models, 216 with images and 224 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Philips - Schweiz