About The cup colour. Mine is definately more brown than red. I't is very early production number so this adds to the assumption that older ones are more brown.
About pads... I have not tried any proper replacement pads but I experemented with Philips SBC hp890 pads. Less bass, brighter sound as is usually the case with velour earpads. So not at proper replacement but worth a shot If one wants to try something new for cheap. Used hp890 should not cost much More than $30. I assume hp840 pads would also fit but just by looking at the pictures hp890 pads are much better quality.
About pads... I have not tried any proper replacement pads but I experemented with Philips SBC hp890 pads. Less bass, brighter sound as is usually the case with velour earpads. So not at proper replacement but worth a shot If one wants to try something new for cheap. Used hp890 should not cost much More than $30. I assume hp840 pads would also fit but just by looking at the pictures hp890 pads are much better quality.