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Screened Four Screengrid

Screened Four Screengrid; Burndept Ltd. London (ID = 840351) Radio Screened Four Screengrid; Burndept Ltd. London (ID = 840352) Radio
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Screened Four Screengrid; Burndept Ltd. London (ID = 840351) Radio
Burndept Ltd. London: Screened Four Screengrid [Radio] ID = 840351 933x768
Select picture or schematic to display from thumbnails on the right and click for download.
For model Screened Four Screengrid, Burndept Ltd. London
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Burndept Ltd. London
Year: 1927/1928 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: S625 PM5X L525 or LL525 PM256
Main principle TRF with regeneration; 2 AF stage(s)
Tuned circuits 2 AM circuit(s)
Wave bands Broadcast (MW) and Long Wave.
Details
Power type and voltage Storage and/or dry batteries / 100 or 120 or 150 or 180 & 20 & GB & 6 Volt
Loudspeaker - This model requires external speaker(s).
Power out
from Radiomuseum.org Model: Screened Four Screengrid - Burndept Ltd. London
Material Wooden case
Shape Tablemodel, Box - most often with Lid (NOT slant panel).
Dimensions (WHD) 19 x 11.5 x 13 inch / 483 x 292 x 330 mm
Notes Burndept Wireless Ltd., London (from Witt Brunham of Burnham & Co.) has manufactured a few early screen grid radios under the name of "Screened". They first used the double ended valve S625 but in the next year the single ended 220SG was used. See also Bowyer-Lowe Co. Ltd. in Letchworth for such sets.

This model Screened Four has a mahogany case with sloping exposed mahogany control panel and hinged fielded panel lid. The early double-ended S625 screened grid valve from Marconi-Osram (designer H.J. Round, MO Valve Co. Ltd.) is visible in the top of the cabinet after lifting the lid. At the back there is an opening which leads to terminal board with 12 posts with clamping screws: Aerial, +/- Loudspeaker, +/- GB (Grid Bias), HIgh Tension 2 (HT2 +) with possible GB values for 100 (10.5), 120 (15), 150 (22.5) and 180 (30), High Tension 1 (HT1 +) and HT-, Heater 6 V +/-, Gram and Earth. There is a sticker with the mentioned valves including the Heater Resistors and the Grid Bias for the given HT2-values.
Net weight (2.2 lb = 1 kg) 9.5 kg / 20 lb 14.8 oz (20.925 lb)
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 Burndept Ltd. London
Here you find 89 models, 55 with images and 26 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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