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KB 151

Country:  Great Britain (UK)
Manufacturer / Brand:  Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB
Year: 1929 Category: Loudspeaker, headphone or earphone
Wave bands - without
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 11.5 inch = 29.2 cm
Power out
from Model: KB 151 - Kolster Brandes Ltd. KB, K.B.,
Material Wooden case
Shape Tablemodel, low profile (big size).

This speaker would have required a DC power supply to energise the electromagnet. It is not known if this was included in the speaker or if a supply from the radio was required.
A similar speaker fitted into the KB 214 was wired across the HT supply of approximatly 175 to 200 volts. The field coil resistance was estimated at 13,000 ohms.

The speaker chassis (driver) was also available seperatly as the KB 125

Mentioned in - - Manufacturers Literature

Model page created by Mike Edwards. See "Data change" for further contributors.

All listed radios etc. from Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB
Here you find 412 models, 364 with images and 252 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.