Need a little help. I'm getting constant 'clicking' sounds from my amp that starts without anything plugged into the RCA jacks so it's not coming from interference from source. At first I thought it might be a new input tube that hadn't burned in, but I tried a Telefunken that's sounded clean before and still got the clicking sounds. Using TS 5998 as output tube, and that too has previously sounded great.
So I was thinking as first step I'll clean the tube pins and tube sockets, and then check all connections. Cleaning the tube pins seems easy enough, but any advice about the best way to clean the sockets is appreciated, as well as the best contact cleaner to use. Also, the output tube 'wobbles' quite a bit more than the input tube. Could this be a possible cause of the noise, i.e., not a tight enough connection? The wobble is not new (sounded great before) so I'm a little reluctant to try to mess with that unless that's an obvious red flag. I bought this used so not sure if the wobble is normal, or if the output socket needs to be tightened or replaced.
Any other likely causes?
Thanks in advance.