• Country
• Great Britain (UK)

• Manufacturer / Brand
• Radio Instruments Ltd. & Aeronautical & General Instruments, Ltd.; London

• Year
• 1927

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 202786

• Number of Tubes
• 5

• Valves / Tubes
• Interdyne_valve Interdyne_valve unknown_Tube unknown_Tube unknown_Tube

• 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: Interdyne Receiver - Radio Instruments Ltd. &

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

• Notes
• By means of two separate anodes, a double grid, connected with symmetrical primary and neutralising windings, effective stabilising is produced without the use of auxiliary apparatus. Two HF stages are employed, the three transformers being enclosed in the compartments of a copper screening box. A wave range of 200-600 metres is obtained with adjustable aerial tappings. The valve detector is followed by two LF stages employing a combination of both resistance-capacity and transformer coupling. Tuning is effected by a single knob operating a three-section condenser arranged laterally behind the panel so that each condenser is closely associated with its transformer winding.
  Similar model by Varley.

• Source of data
• Wireless World (The), London (WW, 79)

• Author
• Model page created by John Koster. See "Data change" for further contributors.

• Other Models

• Here you find 49 models, 43 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Instruments Ltd. & Aeronautical & General Instruments, Ltd.; London