• Country
• Great Britain (UK)

• Manufacturer / Brand
• Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)

• Year
• 1943–1946 ?

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 120420

• Number of Tubes
• 8

• Valves / Tubes
• ARTH2 X66 KTW61 KTW61 DH63 KTW61 6V6G KTW61

• Main principle
• Superhet with RF-stage; ZF/IF 570 kHz

• Wave bands
• Broadcast, Long Wave and more than two Short Wave bands.

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

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Power out
• 2 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: CR300/1 [Admiralty Patt. M500A] - Marconi Co. Marconiphone,

• Shape
• Boatanchor (heavy military or commercial set >20 kg).

• Dimensions (WHD)
• 16.25 x 13.75 x 16.12 inch / 413 x 349 x 409 mm

• Notes
• Multiband receiver covering 15 - 25 MHz in 8 ranges (15-85 / 375-1000 kHz (both IF 98 kHz) / 85-210 / 210-550 kHz, 1-2,6 / 2,6-6,8 / 6,8-17 / 17-25 MHz (with IF 570 kHz)); AM, CW (BFO).
  Analog dial, logging dial with numbers, 500 kHz crystal calibrator, internal speaker.
  Powered by 24V AC heaters and 250V DC B+ or 110/220V DC or 230V AC with matching 889 power supply (rectifier tube 0Z4).
  CR300/1 mainly used by Royal Navy.

• Net weight (2.2 lb = 1 kg)
• 24.8 kg / 54 lb 10 oz (54.626 lb)

• Source of data
• Shortwave Receivers - Past & Present (3rd ed.)

• Mentioned in
• -- Original-techn. papers.

• Author
• Model page created by Martin Bösch. See "Data change" for further contributors.

• Other Models

• Here you find 500 models, 334 with images and 316 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)