Brand Philips
Type BX690A
Picture 
Mario Huizinga Roberto Licandro  
Year 1949
Power AC (110/125/145/200/220/245V) 60W
Bands LW (715-2000 m)
MW (185-580 m)
6 X SW 37-50 m, 31-42.5 m, 24-31.8 m, 19-25.8 m, 15.5-20 m 13-17 m
IF 1 452 KHz
Cabinet Wood
Size 63 x 40 x 26 cm
Weight 14.5 kg
Controls Vol/off, tone/bandwidth, bands, tune
Speaker 9704-05 21cm, 7 Ohm
Price Fl 425,-
Tubes ECH21 (osc./mixer)
EAF42 (IF stage and AVC)
EAF42 (AF and det.)
2x EL41 (pushpull output)
EM4 (tuning eye)
AZ1 (rectifier)
Dial 2 X 8045D-00
Notes The Philips BX690A has a peculiar output stage, consisting of a push-pull output, but there is no tube working as the phase inverter. Instead, one tube is driven directly from the preamplifier and the other tube has no signal on its control grid; the two cathodes are connected to each other and carry the signal, fed back from the output transformer. Thus the second tube is actually driven from the output of the first tube, comparable to the series-balanced output, but here the driving signal goes all the way through the output transformer (big job with 10 wires).The band indicator is also nice: rotating the band switch elevates the entire dial such that the chosen band is the lowest one visible.The radio offers very good sound quality, and is very selective and sensitive on all its eight bands. Just a BFO and the 11m and 80m bands would turn it into a nice ham receiver!
Data source Gerard's Radio Corner
Service documentationThe service documentation can be downloaded from Radiotechniek en Restauratie


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