Just wanted to give a shout-out for Krackle-Killers, as reviewed here:
https://www.soundonsound.com/reviews/krackle-killers
One of those little-known products which can be a real boon when it comes to less-than perfect jack sockets, and which deserves recommendation.
I had some unwelcome crackles from a couple of sockets in a used DI rack box found on ebay. A couple of goes with a krackle killer and some deoxit has cured the problems completely.
Available directly from the inventor in Australia:
https://kracklekillers.com/shop
Definitely worth keeping a bag or two in your musicians toolkit, alongside the can of deoxit, pliers, screwdrivers, and spare strings!
I have no affiliation with the product other than as an appreciative user.
Krackle Killers
Krackle Killers
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(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
Re: Krackle Killers & JackCaps
Thanks for the reminder Hugh - VERY useful, and obviously very effective! 
While discussing 'socket maintenance' I suspect your post is also a suitable place to remind everyone about JackCaps, which I know you and I routinely use to prevent dust getting into unoccupied sockets, not only 6.35mm and 3.5mm jacks, but also XLRs and MIDI.
At 35p to 70p each in the UK, they are also an absolute bargain!

You can buy them from www.jackcap.co.uk
While discussing 'socket maintenance' I suspect your post is also a suitable place to remind everyone about JackCaps, which I know you and I routinely use to prevent dust getting into unoccupied sockets, not only 6.35mm and 3.5mm jacks, but also XLRs and MIDI.
At 35p to 70p each in the UK, they are also an absolute bargain!

You can buy them from www.jackcap.co.uk
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Re: Krackle Killers
Good call. Yes, I'm a big fan of them too.
- Hugh Robjohns
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Posts: 43693 Joined: Fri Jul 25, 2003 12:00 am
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Technical Editor, Sound On Sound...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
Re: Krackle Killers & JackCaps
Martin Walker wrote: ↑Sat May 31, 2025 2:42 pm Thanks for the reminder Hugh - VERY useful, and obviously very effective!
While discussing 'socket maintenance' I suspect your post is also a suitable place to remind everyone about JackCaps, which I know you and I routinely use to prevent dust getting into unoccupied sockets, not only 6.35mm and 3.5mm jacks, but also XLRs and MIDI.
At 35p to 70p each in the UK, they are also an absolute bargain!
You can buy them from www.jackcap.co.uk
3.5 jacks? I'd need about two thousand quids worth in my studio!
"I will not say: do not weep; for not all tears are an evil" Gandalf - J.R.R. Tolkien.
Re: Krackle Killers
Hugh Robjohns wrote: ↑Sat May 31, 2025 2:23 pm
Available directly from the inventor in Australia:
https://kracklekillers.com/shop
Definitely worth keeping a bag or two in your musicians toolkit, alongside the can of deoxit, pliers, screwdrivers, and spare strings!
How cute!
And all this time I've been re-purposing my old used dental brushes ("Piksters") and dunking them in Deoxit to achieve the same effect...
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Re: Krackle Killers & JackCaps
Yes, I can understand that, especially with your love of Eurorack
Personally I'm thankful to have JackCaps in all my horizontally mounted 6.35mm jack sockets (mixing desks and so on), as these are prime targets for falling dust.
I also have them in unoccupied sockets on my keyboards/synths - plenty of musicians who play live find them invaluable on stage for this purpose, as it makes it so much easier in the dark to find the main L/R outputs when some keyboards have a dozen or so sockets on their back panels!
- Martin Walker
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Re: Krackle Killers & JackCaps
Looks like a prime candidate for 3D printing to me - a perfectly good 3D printer and a 1kg roll of filament costs around £150.
https://www.thingiverse.com/thing:6540710
is the first design that I found but there are lots of alternatives.
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