• Country
• Great Britain (UK)

• Manufacturer / Brand
• Popular Wireless Weekly (periodical); London E.C.4

• Year
• 1933

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 245881

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

• Number of Tubes
• 3

• Valves / Tubes
• PM12A or 220SG or SG215 PM1HL or 210HF or HL2 PM2A or 220PA or P220

• Number of Transistors

• Semiconductors
• W4_Westector

• Main principle
• TRF with regeneration; 1 AF stage(s); Screengrid 1926-1935

• Tuned circuits
• 2 AM circuit(s)

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

• Power type and voltage
• Storage and/or dry batteries / 2 & 16.5 & 120 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Northern Star - Popular Wireless Weekly

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 16 x 7 x 0 inch / 406 x 178 x 0 mm

• Notes

• Typical 1928 to 1934 "S.G." (Screen Grid i.e. RF Tetrode), "Det" (Triode detector), LF (Triode audio amp) type TRF kit. With stronger stations and suitable output triode a Reed Speaker or Transformer + Moving coil can be driven. The Output Grid bias needs adjusted according to type or load or output triode.

  The "novel" feature of this model is a miniature "Westector" Metal Rectifier  for a degree of "automatic" bias on the output valve (tube) to reduce HT consumption. See Murphy BU183A for 1950s version of "sliding" bias. Volume control is a 10K potentiometer with an on/off switch on the aerial input.

  Base board + ebonite panel construction with optional box/cabinet.

  Tapped HT such as Winner 120 . (75 to 80V tap).
  Grid Battery 16.5V or two Winner 9 in series.

  Optional Mains Supply kit in same September 30th 1933 Issue, for HT only.

  Recommended valves (all B4 base) with Optional alternate output types:

  Make	S.G.	Det.	Output	Option
  Mullard	PM12A	PM1HL	PM2A	PM202
  Cossor	220SG	210HF	220PA	230XP
  Mazda	SG215	HL2	P220	P220A
  Marconi	S22	HL2	LP2	P2
  Osram	S22	HL2	LP2	P2
  Hivac	BY6	H210	P220	PP220
  Eta	BY6	BY2020	BX604	BW602

  An earlier magazine SG Det LF kit is here. Also see Scott-Taggart and Ready Radio kits.

• Author
• Model page created by Michael Watterson. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 2 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Popular Wireless Weekly (periodical); London E.C.4