|Year of construction
|EF 22: HF-amplifier
ECH 21: Mixer
EF 22: MF-Amplifier
ECH 21: MF-Amplifier, AF-amplifier
EBL 21: (2x): AF-Outputstage, Detection, AVC voltage
EM 4: Tuning-indicator
AZ 4: Rectifier
|The output stage of
this one is uncommon: it features a balanced outputstage with two EBL21's!
Combining multiple functions in a tube was a skill often practised by Philips.
The introduction of the EBL21 was intended for the 4-tube
design in wich the two diode sections of the tube have the function
of detector and AVC voltage feedback supply.
Needless to say that the sound of this radio is fantastic, not in the least because of the massive 300mm speaker.