Philips B0X19U/00L

1961

Condition and performance:

	Cabinet	60%
	Reception AM	60%
	Sound Quality AM	60%

Features:

	P.U. Entrance:	No
	Tape Recorder Entrance:	No
	Extra Loudspeaker Output:	No
	Loudness:	No
	Treble Control:	No
	Bass Control:	No
	Tone Register Switches:	No
	AM Bandwidth Switch or Control:	No
	Tuning Indicator:	No
	Build-in Antenna:	Yes, plate antenna
	Build in Ferrite or Window Antenna:	No

Technical Specifications (Partially measured):

	Tubes:	UCH81, UBF80, UCL82, UY89.
	Wave Bands:	MW
	Intermediate Frequency (IF):	452 kHz
	Loudspeaker:	AD 1400/00
	Resonance Frequency Fs:	?
	Frequency Range Power Amplifier:	?
	RMS Output Power at 3 Ohms:	1.5 Watts
	Cabinet:	Bakelite, orange painted
	Dimensions:	26.2 x 13.8 x 14.2 cm
	Mains Power Voltages:	110, 127, 220 Volts~
	Mains Power Consumption	43 Watts
	Retail Price	?

Description:

The Philips B0X17U is the same radio as the Philips B0X15U, but the dial scale is different. It has a needle which shifts in the horizontal direction.
The electronic circuit and performance is the same same as the Philips B0X15U.

Repairs:

Paper/tar capacitor C19 of 100 nF is replaced by an ERO capacitor of 100 nF 1000V.
Reason: This capacitor is exploded due to leakage.
Ceramic capacitor C18 of 10 nF is replaced by 10 nF 630V.
Reason: Ceramic capacitor seems te be have flash-overs which results in noise and a crackling sound.
A 120R 5W resistor is added in series with the heater circuit.
Reason: The heater circuit is now calculated for 232V~ mains power voltage.
Amplifier is modified, similar as in the Philips B0X15U for more stability and a better sound quality. See the schematic diagram below.

After these improvement, the radio plays much better. In the future, the volume potentiometer will be decoupled from the AM detection circuit. See the report of the Philips B0X17U how this can be done.

Below you see an example of the added components how to get more bass output. The coupling capacitor C17 of 4700 pF 1000V is also renew.

Performance:

The sensitivity of this radio is just sufficient, but to receive more distant broadcast stations, it is recommended to connect an external antenna. A piece of wire of 2 meters is sufficient.
The sound quality in its original state is very thin and harsh. There is no loudness circuit build in as well as no negative feedback circuit. After adding some extra components, the sound quality has improved a lot.

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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