• Country
• Australia

• Manufacturer / Brand
• Airzone (1931) Ltd.; Sydney

• Year
• 1937

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 109116

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

• Number of Tubes
• 5

• Valves / Tubes
• 6A7 6D6 75 42 80

• Main principle
• Superheterodyne (common); ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast and Short Wave (SW).

• Power type and voltage
• Alternating Current supply (AC) / 200-250 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 6.5 inch = 16.5 cm

• Material
• Bakelite case

• from Radiomuseum.org
• Model: Radio-Star 560 Ch= 521 - Airzone 1931 Ltd.; Sydney

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Notes

• Airzone model "560" is a five-valve receiver, using chassis type "521", which is designed for dual-wave coverage and operating from 200-250 volts A.C. mains. This receiver is housed in a moulded cabinet of the mantel type, and is fitted with four controls - volume, tuning, wave-change (with wave-band indication by dial-scale illumination), and tone (3 positions). The loadspeaker fitted to this receiver is a 6½ inch unit with a field coil resistance of 1,500 ohms. This receiver was introduced during 1937.

  The design of this receiver is quite conventional and circuit analysis should present no particular difficulty. Points to watch are the shunt-fed oscillator feed-back system; the section of the wave-change switch which short-circuits the broadcast oscillator grid coil when the receiver is adjusted for S.W. operation; and the bleed bias system for the type 75 triode section. (RADIO TECHNICIAN)

• Price in first year of sale
• 19.95 AUS £

• Circuit diagram reference
• Australian Official Radio Service Manual Vol. I I

• Literature/Schematics (1)
• Radio Technician (August 1939.)

• Literature/Schematics (2)
• Australian Official Radio Service Manual AORSM (Volume 2, 1939, Page 22 (shown as 521 (chassis type)).)

• Author
• Model page created by Peter Hughes. See "Data change" for further contributors.

• Other Models

• Here you find 283 models, 130 with images and 154 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Airzone (1931) Ltd.; Sydney