The season is changing, old guitars are coming out of cupboards, humidity is rising and jack socket are oxidising.
It's pretty simple really, if you've got a crackly jack it may just need cleaning.
Incidentally, it's an "output" jack, not an "input" jack - just a pet hate of mine.
You can see the jack in this Les Paul is looking a tad fluffy. This one isn't very bad but it's worth a clean anyway as part of a set up.
I use 600 grade wet'n'dry paper used dry.
I simply tear a piece off, roll it up and clean the jack out with it. A squirt with some contact cleaner can help. It's good to keep a piece in your guitar case in case your jack goes crackly at a gig.
You can see a fair bit of dirt can come off even this relatively clean jack. Just think what that was doing to your earth connection.
If a jack is really bad and the customer is gigging I usually just replace it. It doesn't cost much and it's something you just can't do without.
Feel free to contact me, the workshop phone is always the best 09 307 6501.
If I don't answer don't be shy to leave a message, it's not easy for me to pick up the phone sometimes.
I very rarely check emails these days, I never seem to find time.
Mr Glyn’s Guitars
21B Khyber Pass Road
09 307 6501, 021 912678