Could be vibration in the bridge, check there are no loose springs, maybe something was left loose when you adjusted the intonation for the heavy set of strings.
Hi For sale/trade is my CMD 121H with a Hotcovers cover, bought 5 years ago from thomann. Its been used in my Church so i dont think i have played it loud at all since buying it. In great condition, really clean no issues.
There is something to be said for being able to lift a bass amp with 1 hand!
link for spec at markbass.it
Price includes delivery
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Trades: ill consider all offers, basses or acoustic guitars.
Any question then please ask.
I bought this about six months ago from Amazon, it's in great condition with the full box, paperwork, instructions and essential velcro on the bottom!
I have a Helix HX, its looper is fine for what i need.
£90 delivery included.
Great pedal, with up to 8 presets. No charger, I used it on a 9v daisy chain.
Some dings and scratches but in perfect working condition.
£120 delivered in the UK