Good advice.
It's easier said than done, but it should certainly be considered. Get it done by an amp tech unless you know your way around an electrical circuit.
Good advice.Change the tube sockets!You are wasting your time trying to re-tension the pins and fender's are notorious for poor contact in this area.Do not use ceramic tube sockets,as they are poor quality unless you get the new style fender ones used in some new model production amps.They have a 'memory' on the pins and will last longer than the originals.Tube retainers are a band-aid at best.Ask any tech who has tracked down crackles and low output power on an old fender amp.
I use Belton tube sockets with tremendous success.If you cheap out and get lazy,you will reap the penalty.Do the job once.
www.claramps.com