• Country
• Great Britain (UK)

• Manufacturer / Brand
• Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB

• Year
• 1928

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 134080

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

• Number of Tubes
• 3

• Valves / Tubes
• PM12 PM1HF PM22

• Main principle
• TRF with regeneration

• Tuned circuits
• 2 AM circuit(s)

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

• Power type and voltage
• Storage and/or dry batteries

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: KB 102 - Kolster Brandes Ltd. KB, K.B.,

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

• Dimensions (WHD)
• 18 x 11 x 8 inch / 457 x 279 x 203 mm

• Notes

• Screen gride battery set. Later version of model Brandeset IIIA but using screen grid valves. This model 102 has a single tuning control, the very similar model 163 has dual tuning controls.

  The radio has reaction over 2 valves, from the grid of the PM12 to the anode of the PM1HF. 

  In order to function well, the chokes in the anode of the PM12 have to have a self resonance lower than the lowest frequency of the band selected.

  The reaction on LW relies at the cable capacitance between the tuning capacitor wiring and the reactance capacitor wiring, wich are closely routed for approx 3 inches, The connection from the reactance capacitor and the grid of the PM12 is switched OFF during LW reception to avoid excessive reactance.

• Mentioned in
• Radio! Radio!

• Literature/Schematics (1)
• - - Manufacturers Literature (Date given in KB Schedule of Products)

• Author
• Model page created by Keith Staines. See "Data change" for further contributors.

• Other Models

• Here you find 415 models, 372 with images and 253 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB