12 table model

Ferguson (in the United States - see text)

Data
Forum
Pictures
Collections

  • Year
  • 1926/1927
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 40495
    • alternative name: Ferguson Co., J.B. || Ferguson Radio Corp. || Ferguson Radio &Television Co., Inc.

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Valves / Tubes
  • Main principle
  • TRF (Tuned-Radio-Frequency but use of regeneration unknown)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 12 table model - Ferguson in the United States
  • Shape
  • Tablemodel, with any shape - general.
  • Notes
  • Two dials (primary tuning control knobs)
  • Price in first year of sale
  • 75.00 $
  • External source of data
  • Ernst Erb

 Collections | Museums | Literature

Collections

The model 12 is part of the collections of the following members.

 Forum

Forum contributions about this model: Ferguson in the: 12 table model

Threads: 1 | Posts: 3

Hello,

       I own a Ferguson - 12, but I do not know if it is the old or the new one. I have unmounted it from the case for drawing schematic and doing some minor repairs.
    It has 3 AF stages. The coupling between 1-2 and 2-3 are RC. The coupling between detector and 1st AF is by a transformer of the brand “Silver - Marshall”. Because the shape of transformer mounting and  connections I think it could not to be the original.
    In addition, I need some information about DC supply:
     The are four +B sources ( detector plate, RF , AF(1-2) stages and power stage. May be 22.5 for detector, 135 for power and ¿ what for AF and RF ?
    There is -C for grid returns of the 3 AF stages, the same for all three, two of them 201A and the last one of 112A type. For both tubes -C would be -9 volts if +B were 135. But 201A and 112A have a diferent DC wire.

    The reostat  is only conected to the RF amplifier (2 tubes). Then, all other tubes should work at battery voltage ( 6 or more volts) ?
    Finally, I suppose that -B is connected to ground. Ins this case, if +A battery is connected to -B, the grid return of AF would be to +A, not usual, I think. The grid of detector tube returns also to +A, but it is a 200A, and for this also seems to be wrong.

     I will be thankful for much any information or suggestion on this subject.

Felix Corrochano, 13.Jan.11

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