Electro 4 reverb wet mix (?) suddenly boosting

[jon54]

Lately when I'm playing any program, the reverb will suddenly kick up a significant notch, as though the dry/wet knob has been cranked +50%. I have to re select the same program to return the reverb to how it was originally saved. This can happen 2-3 times per minute of playing... so annoying!

No LED changes are observed during the 'jump', and the change is not as extreme as selecting a different reverb program, so it's possibly just confined to the dry/wet pot. Could opening the hood and spraying the pot with elec contact cleaner be worth a shot?

I wondered if anyone had experienced similar random jumps with on-board effects and if a fix had been found.

Thanks for your ideas/knowledge

[Eumel]

Hi,

This is a known problem. When you are playing, the whole keyboard is mechanically shaking. This might lead to a slight change of the reverb poti position. I have the same problem on my NS4.

Greets

Eumel

[Schorsch]

An easy fix is to put a rubber ring under the knob, with which a higher force is needed to turn the know. Just search for Potifix and you will find the available options.

[jon54]

Thanks for the responses. The knob in no way feels loose, but I guess vibration could cause a tiny shift. I'll try adding an O-ring under the knob.

[jon54]

Update: Previously I'd removed the knob, and just touching the metal stem was enough to cause reverb jumps. Then I replaced the knob & wound it down to zero before powering on the Electro. So far reverb has stayed stable. Haven't tried the o-ring yet as our house painter had trestles blocking the shed door where my plumbing bits & pieces reside