Philips BX233U-22

1953

Condition and performance:

	Cabinet:	80%
	Reception AM:	80%
	Reception FM:	70%
	Sound Quality AM:	70%
	Sound Quality FM:	70%

Features:

	P.U. Entrance:	No
	Tape Recorder Entrance:	No
	Extra Loudspeaker Output:	No
	Loudness:	Yes, bass
	Treble Control:	Yes, switchable
	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 and LW
	Separate AM/FM tuning:	Yes

Technical Specifications (Partially measured):

	Tubes:	UC92, UCH81, UF85, UABC80, UL41, UY42
	Wave Bands:	LW, MW, FM from 87.5 - 100.5 MHz
	Intermediate Frequencies (IF):	452 kHz, 10.7 MHz
	Loudspeaker:	9742 X
	Resonance Frequency Fs:	?
	Frequency Range Power Amplifier:	?
	RMS Output Power at 5 Ohms:	?
	Cabinet:	Bakelite, brown
	Dimensions:	33 x 22 x 14.5 cm
	Mains Power Voltages:	110, 127, 220 Volts~
	Mains Power Consumption	45 Watts
	Retail Price	-

Description:

This little Philips BX233U-22 is from German factory origin. Next to LW and LW, an FM tuner is also build in, which contains only a UC92 tube.

Repairs:

All the bad Wima and ERO capacitors are replaced for optimal safety and performance.

Capacitor C3 of 22 nF is replaced by 22 nF 1000V
Reason: This capacitor was exploded.
Coupling capacitor C58 between UABC80 and UL41 of 15 nF is replaced by 15 nF 630V.
Reason:
UY42 is missing and is placed by a new one.
UF89 is replaced by an UF85.
Reason: UF89 is the wrong type and has less trans conductance as the UF85, which lead into less reception sensitivity of the AM and FM bands.

Performance:

After replacing all the bad capacitors and making some modifications at the FM de-emphasis circuit as well as the amplifier and loudness section, the radio plays now well and the type of sound is a neutral type of sound. Clear enough on FM and a full sound on AM.

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 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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