There will be a slight change in cross-sectional inductance as well as a new parasitic capacitance that forms between the resistors. But since RS-485 is current loop, the inductance and capacitance changes will only be a problem at very high frequencies, which is unlikely to be the case here. Ultimately my concerns with the Frankenresistor are those related to their connection. Though OP used 60/40 Sn/Pb solder, there is the chance that cold joints will change the resistance/impedance of the compound resistor over time. It's probably not a major issue at all, but if it's for some critical industrial control application, I would definitely change it out as soon as possible with a good high quality, tight tolerance metal film resistor just to avoid liability issues that could pop up in a failure incident investigation.
There will be a slight change in cross-sectional inductance as well as a new parasitic capacitance that forms between the resistors. But since RS-485 is current loop, the inductance and capacitance changes will only be a problem at very high frequencies, which is unlikely to be the case here. Ultimately my concerns with the Frankenresistor are those related to their connection. Though OP used 60/40 Sn/Pb solder, there is the chance that cold joints will change the resistance/impedance of the compound resistor over time. It's probably not a major issue at all, but if it's for some critical industrial control application, I would definitely change it out as soon as possible with a good high quality, tight tolerance metal film resistor just to avoid liability issues that could pop up in a failure incident investigation.
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