Philips
models 312A, 312H, 493A and E150A (1940)
312A interior
312H interior
General features
|
Radio type |
Mains powered table radio |
|
Circuit type |
Superheterodyne, 452kHz IF with
delayed AVC |
|
Dimensions (312A, 312H, 493A) |
340x290x225mm, 5kg |
|
Dimensions (E150A) |
mm, 5kg |
|
Cabinet |
Bakelite, cloth grille, printed
glass dial |
|
Loudspeaker |
165mm, moving coil, permanent
magnet |
|
Main controls |
Volume/on-off, tuning, waveband
switch |
|
Extra controls (312A and 312H) |
none |
|
Extra controls (493A) |
Slider tone control |
|
Extra controls (E150A) |
Rotary tone control |
|
Connections |
Antenna, ground |
|
Power (312A, E150A, 493A) |
AC, 110-245V in 6 steps, 38W |
|
Power (312H) |
AC or DC, 110V or 220V |
|
Power transformer (312A, E150A,
493A) |
autotransformer (series heated
tubes and one side of mains to chassis) |
Wave
bands
|
MW |
160-570m |
|
MW local |
160-570m |
|
SW |
45-160m |
|
SW |
13.5-45m |
Circuits
and Tubes
|
Oscillator and mixer |
ECH3 triode-hexode |
|
IF amplifier |
EF9 remote cutoff pentode |
|
Detector and audio amplifier |
EBC3 duodiode-triode |
|
Audio power amplifier |
CL4 9W pentode |
|
Rectifier |
CY1 indirectly heated single power
diode |
|
Current regulator (312H only) |
C1 (220V operation) or C9 (110V
operation) |