Philips model 2531

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General features

Radio type

Early mains powered table radio with separate loudspeaker.

Circuit type

Single stage tuned radio frequency, reactive detector

Dimensions


Cabinets

Bakelite, with cloth and metal grille

Loudspeaker

200mm, moving iron, permanent magnet

Main controls

Primary and secondary tuning, reaction, grid bias (volume), waveband switch, power

Extra controls

Loudspeaker on/off

Connections

Antenna, ground, PU, extra loudspeaker

Power

AC, 103-253V in 12 steps


Wave bands

Lower band

950-400m

Higher band

400-250m


Circuits and Tubes

RF amplifier

E442 sharp cutoff tetrode

Reactive detector

E424N triode

Audio power amplifier

C443 directly heated pentode

Rectifier

506 directly heated power dual diode