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This site is dedicated to the KB ITT Radios which were available in the UK during the 20th century
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Kolster Brandes, WP31, "Calypso" 1963

The KB WP21/L right side
showing the car aerial socket

The left side showing the earphone socket (top)
& the microphone socket
The KB WP21/L rear

The KB WP21/L chassis

Portable MW & LW
9 Transistor Radio

Transistors; AF117 Y159 AF117 OC70 OC75 OC81D OC81 AC127 2G309

Power supply; 9 volt, Ever Ready PP9

Dimensions mm; W=254, H=191, D=89

See the KB WP31 "Calypso" in the Radio Museum

KB WP31 Service information

Notes; There are two models of the KB Calypso, the WP31 and the WP31/L, this example is the earlier.
The visual differences between the WP31 and the WP31/L include, " Luxembourg " marked boldly on the lower half of the dial, and 2 small trimmer capacitors are mounted on the switch assembly.
The KB Calypso models share the same chassis as the corresponding KB Lyric.

The KB service manual states; The difference between the WP2I and WP21/L versions of these models, are as follows:
On the /L versions, the microphone amplifier is permanently connected to the input of the main amplifier and cannot be switched via the volume control by pressing the M.W. and L.W. buttons together.
When the M.W. and L.W. buttons are pressed together on the /L versions, giving Luxembourg bandspread, T2, Cl, C2, T3 and C10 are switched into circuit, reducing the frequency range of the medium waveband circuitry.

Alternative transistors;
2SG417 Y159 2G417 2G317B 2G374B 2G374B 2G381A 2G339A 2G309


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 Last modified: 08-02-2020
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