I've had an GK MB800 for years now. It's had noticeable hiss all that time, that has gotten progressively worse
I've sent it in for repair from GK a couple of times; each time it comes back a little better, but then degrades over time
They refuse to give me a replacement; they just tune up whatever's causing this, and send it back to degrade again
I have a feeling it's related to the input jack; if you move a cable around in there, it gets better / worse as you do, as you put pressure at certain angles
What's crazy though is that this happens regardless of volume levels, regardless of if anything is plugged in, regardless of if the amp itself is muted.
I can mute it entirely, turn the volume all the way down, turn all EQs – including the treble – all the way down, and the hiss will still be there.
I can unplug the input jack after doing so, and the hiss will still be there.
But then if I plug it back in, and put pressure at the right angle – still with it muted, still with the volumes off – the hiss can be made slightly better if I push at the right angle.
This is noticeable on all cabs, but is most noticeable on those with a tweeter, because of the frequency range of the hiss.
It sounds like what you'd expect line-noise to sound like when the high-end is *super* boosted. Someone hissing an "sssssss" constantly.
Other heads don't cause this issue through my main speaker; and this head causes the issue through every speaker...
Any advice on getting this fixed-fixed? Anyone else find this to be the case with MB-series heads?? I see mixed results in old threads, but all of those are a good eight years old now, so I'm curious to see how people have found their MB heads to pan out over time....
I've sent it in for repair from GK a couple of times; each time it comes back a little better, but then degrades over time
They refuse to give me a replacement; they just tune up whatever's causing this, and send it back to degrade again
I have a feeling it's related to the input jack; if you move a cable around in there, it gets better / worse as you do, as you put pressure at certain angles
What's crazy though is that this happens regardless of volume levels, regardless of if anything is plugged in, regardless of if the amp itself is muted.
I can mute it entirely, turn the volume all the way down, turn all EQs – including the treble – all the way down, and the hiss will still be there.
I can unplug the input jack after doing so, and the hiss will still be there.
But then if I plug it back in, and put pressure at the right angle – still with it muted, still with the volumes off – the hiss can be made slightly better if I push at the right angle.
This is noticeable on all cabs, but is most noticeable on those with a tweeter, because of the frequency range of the hiss.
It sounds like what you'd expect line-noise to sound like when the high-end is *super* boosted. Someone hissing an "sssssss" constantly.
Other heads don't cause this issue through my main speaker; and this head causes the issue through every speaker...
Any advice on getting this fixed-fixed? Anyone else find this to be the case with MB-series heads?? I see mixed results in old threads, but all of those are a good eight years old now, so I'm curious to see how people have found their MB heads to pan out over time....
