Philips - L4X60BT

Philips portable with tubes and transistors - type L4X60BT

Brand and type: Philips - L4X60BT - portable.

Produced: The Netherlands - 1956

Cabinet: Dark green, almost black plastic.

Tubes: DK96 (mixer/osc.) - DF96 (1st IF-stage) - DF96 (2nd IF).
Semiconductors: OA85 (detector) - OC71 (driver) - OC72 (2 piece - balanced output stage).
Phase inverting is obtained by a transformer in the driver stage. Sometimes you will find both output transistors dead in
these early transistor radios, because batteries have been connected the wrong way. These PNP-types require the
positive lead connected to ground. In case of trouble one could order a specially selected matching pair of OC72s at the Philips Service Department. US-equivalents for OC71/72 are 2N280 or 2N282, respectively.

Power: Only batteries in this case. A 45V as B+, the total load for this one is 3 mA. 4 D-cells for the filaments
and the transistors, according to the service documentation. But my radio has room for 8 big D-cells. Besides, Philips recommends a voltage of 1.25V for these batteries. In that case they probably refer to NiCad rechargeable cells. In that case you had to bring in your own charger: no way the radio does the job for you....

Bands: Long and medium waves, shortwaves from 1.6-4 MHZ and 5.9-12 MHz. Antennas: a ferrite rod and a single loop for shortwave, which fits around the outside and can be turned up. It's visible on the far left of the picture. OK, use a magnifier.

Controls: Volume and tuning, push buttons for band selection and on/off.

Obtained: In april '95 from a fellow collector. I was hesitant to buy it at that moment because I already had the same radio in ivory white with red knobs. But it looked OKand the price was right so why not....

Condition: 8. All brass is sprayed with varnish to avoid blackening. The dial glass has a small crack in the middle, just like my white portable. This seems to be a nasty habit as I've seen this a lot of times on the same radios.

Working: Like new. Output power is approx. 300 mW. A bit more than the preceding models with tube output. Audio quality is fine.