omg they took autist measurements of sand cast vs metal oxide vs wirewound resistors but what about carbon comp vs metal film
metal oxide seemed good as it held a steady 1.5ohm at 100hz impedance and 1.53ohm at 20khz but metal oxide isn't the same as metal film
especially in vintage gear the carbon comp resistors might have aged poorly so it might be worth replacing them with metal film resistors if it's a prioritized piece of gear where you really want the stereo channels to be matched as closely as possible although in most pro audio gear a lot of the important ones are already metal film