Try an on-line search for "Phillips RH750 service manual". The only information I've found so far is a forum comment
that it was made for a limited market (Australia?). If the fried resistor was in an amplifier, you could just look at the other channel for the matching part, but we must work with what we have.
One important peripheral item is to check the parts connected to the resistor for shorts. It could just be a slightly over-driven part finally succumbing to years of moderate overheating, or it might be a catastrophic failure due to another part breaking down inside.
If you can't find the service manual or schematic, you may have to reverse-engineer the circuit - trace it, map it out, measure the power supply voltage, then calculate what the resistor should be for proper biasing. If it was a carbon composition resistor, make sure you replace it with a low-inductance type - that can be critical for proper performance in a radio tuner.
If the resistor is part of a section using an integrated circuit, try to find the data sheet and application notes for the chip. A lot of designers just copied the suggested application circuits in these, so all you would have to is correlate the parts and possibly run through a couple of design equations.
You could also post on the forum linked above and ask whomever it is who owns one of these to take a look inside and tell you what the stripes are on his R142. He may want do it just to know whether his unit is headed for the same failure.