OTB Type A

OTB Type A; Harding, Holland & (ID = 1578322) Crystal
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OTB Type A; Harding, Holland & (ID = 1578322) Crystal
Harding, Holland &: OTB Type A [Crystal] ID = 1578322 846x1400
Select picture or schematic to display from thumbnails on the right and click for download.
For model OTB Type A, Harding, Holland & Fry, London:
by courtesy of Ian L.Sanders from Tickling the Crystal vol.1
Country:  Great Britain (UK)
Manufacturer / Brand:  Harding, Holland & Fry, London
OTB (O.T.B.)
Year: 1923 Category: Detector-Radio (Crystal or diode, without tubes/transistors)
Main principle Crystal or Solid State Detector
Tuned circuits 1 AM circuit(s)
Wave bands Broadcast only (MW).
Power type and voltage No Power needed
Loudspeaker - For headphones or amp.
Power out
from Model: OTB Type A - Harding, Holland & Fry, London
Material Wooden case
Shape Miscellaneous shapes - described under notes.
Dimensions (WHD) 0 x 2.25 x 0 inch / 0 x 57 x 0 mm
Notes turned mahogany lidded box,5"dia.; BBC/PMG stamp, GPO No.745;
Source of data Radio! Radio!

Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

All listed radios etc. from Harding, Holland & Fry, London
Here you find 2 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.