Philips model 631A
General
features
|
Radio type |
Early mains powered table radio with integral loudspeaker. |
|
Circuit type |
2 stage tuned radio frequency, 2 tuned circuits |
|
Dimensions |
|
|
Cabinet |
'Arbolite',Bakelite and steel, with cloth grille in Bakelite bezel |
|
Loudspeaker |
200mm, moving iron, permanent magnet |
|
Main controls |
Tuning, reaction, grid bias (volume), waveband switch, power |
|
Extra controls |
|
|
Connections |
Antenna, ground, PU, extra loudspeaker |
|
Power |
AC, 103-253V in several steps |
Wave
bands
|
Lower band |
950-400m |
|
Higher band |
400-250m |
Circuits
and Tubes
|
RF amplifier 1 |
E452 sharp cutoff tetrode |
|
RF amplifier 2 |
E452 sharp cutoff tetrode |
|
Audio amplifier and detector |
E424N triode |
|
Audio amplifier |
E424N triode |
|
Audio power amplifier |
C443 directly heated pentode |
|
Rectifier |
506 directly heated power dual diode |