• Country
• Great Britain (UK)

• Manufacturer / Brand
• McMichael Radio Ltd.; Slough

• Year
• 1948

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 104941

• • alternative name: McMichael, Leslie

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

• Number of Tubes
• 4

• Valves / Tubes
• KK32 KF35 KBC32 KLL32

• Main principle
• Superheterodyne (common); ZF/IF 465 kHz; 2 AF stage(s)

• Tuned circuits
• 6 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and 2 x Short Wave.

• Power type and voltage
• Storage and/or dry batteries / 2 & 136 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 inch = 20.3 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: 484 - McMichael Radio Ltd.; Slough

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

• Dimensions (WHD)
• 672 x 344 x 260 mm / 26.5 x 13.5 x 10.2 inch

• Notes

• Recommended batteries: Ever Ready Portable 56 (a 144V battery for 135V HT and 10.5V Grid Bias) and an Exide CZG3 accumulator (2V Lead Acid LT) . The "0V" is to the +10.5V so that the "Portable 56" 0V/negative terminal is the grid Bias. Three wander plug leads.

  Push Pull audio output. The aerial connection is in series with a 465KHz IF "trap".

  External speaker and gram/PU connections.

  Wavebands

  • LW: 2000 ... 750 m
  • MW: 550 ... 170 m
  • SW1: 175 ... 50 m
  • SW2: 50 ... 16.5 m

  Same chassis isused in  487 Console and 486 Radiogram (different scale and additional lamp, windup/spring Garrard turntable), thus the Wavechange has a Gram position. The cabinet is nearly identical to 481U and 481AC models with the McMichael "lion" logo replacing the Magic Eye.

  Tone control switch with 3 positions.

  Scale Lamps /Bulbs are only on the 486 and 487 versions and are 2.5V 300mA and speaker grill pilot lamp 3.5V 150mA (probably only 486 model).

  Really a 1930s design, but over 1/5th of UK households no electricity in late 1940s and shortage of supplies of Minature Battery valves.

  R&TVS states an Exide CZG3, but it's not obvious where it goes when Portable 56 fitted. An Exide JSK2 Gel or other slimline pack fits easier unless the Portable 56 HT pack is vertical.

• Net weight (2.2 lb = 1 kg)
• 10.4 kg / 22 lb 14.5 oz (22.907 lb)

• Price in first year of sale
• 23.80 GBP

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

• Literature/Schematics (1)
• Trader Service Sheet (suppl. of Wireless & El. Trader, etc.) (876 Sepetember 1948)

• Literature/Schematics (2)
• Radio And Television Servicing books (R&TVS) (1951 Edition Vol1 page 240)

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

• Other Models

• Here you find 183 models, 123 with images and 120 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from McMichael Radio Ltd.; Slough