Time for new chain and sprockets?

[Ricky]

Had a short ride out on the bike today and I think the gear change is much smother and easier to use. Before with the old chain the gear change felt crunchy and not smooth,will need a long run to confirm.
I have noticed there seems to be a bit of a whine, but not sure where it is coming from.

[Dudeofrude]

The slight whine could be a sign the chain is slightly too tight. My old Thundercat used to do it after every service as my old mechanic seems to be useless as getting the tension right. Used to bring the back wheel in a few mm and it would stop.