Philips B2X72U

1957

Condition and performance:

	Cabinet:	50%
	Reception AM:	80%
	Reception FM:	60%
	Sound Quality AM:	60%
	Sound Quality FM:	60%

Features:

	P.U. Entrance:	No
	Tape Recorder Entrance:	No
	Extra Loudspeaker Output:	No
	Loudness:	Yes, bass
	Treble Control:	Yes, continue
	Bass Control:	No
	Tone Register Switches:	No
	AM Bandwidth Switch or Control:	No
	Tuning Indicator:	No
	Build-in Antenna:	No
	Build in Ferrite or Window Antenna:	Yes, MW ferrite antenna
	Separate AM/FM tuning:	Yes

Technical Specifications (Partially measured):

	Tubes:	UCC85, UCH81, UF89, UABC80, UL84, UY85.
	Wave Bands:	MW and FM from 87.5 - 100.5 MHz
	Intermediate Frequencies (IF):	452 kHz
	Loudspeaker:	AD 2460 M
	Resonance Frequency Fs:	159 Hz
	Frequency Range Power Amplifier:	?
	RMS Output Power at 5 Ohms:	?
	Cabinet:	Bake-lite, dark brown.
	Dimensions:	33.5 x 20.5 x 19 cm
	Mains Power Voltages:	220 Volts~
	Mains Power Consumption	52 Watts
	Retail Price	?

Description:

This small radio has only MW and FM reception. There are no extra connectors for a record player or an extra loudspeaker.

Repairs:

This radio is in a very poor condition. cabinet is broken and there is a thick nicotine layer as well as a lot of sticky dust inside. First I have cleaned the cabinet as well as fixing the cabinet with super glue.
Before making any repairs and measurement, a safety transformer is used as well as a series bulb of 220V~ 60W is used. After a few minutes, I found out there are no big problems.

UL84 and UY85 tubes are missing and are placed.
Lamp of 12V 100 mA is missing and is placed by a new one.
Dial cord is renewed.
All tar capacitors are replaced by new polyester film capacitors.
FM ratio detector capacitor of 3,2 µF is replaced by 4,7 µF 63V. Distortion FM reception has now disappeared.
Dual potentiometers are renewed.
Cathode resistors UL84 of 270 Ohms 3 Watts is replaced. The old one was burned out.
UF89 tube is renewed. The old UF89 leads into a poor and insensitive FM reception.

Performance:

After these repairs, the radio plays quite well. Due to the high resonance frequency of the loudspeaker, the sound lacks in the bass.

Disclaimer:

This radio is directly supplied from the mains power. The high voltage supply is directly taken from the mains power, which means the radio chassis and components carries the 230 Volt~ mains voltage, which is very dangerous. Before making any repairs on the radio or playing the radio without the back plate, use a safety transformer with separate windings. The insulation of the windings must withstand at least 4000 Volts AC as well as a low leakage current of 0.5 mA~ or less.

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