Quad Esl 2905 reliability issues?

Correction. " one of the panels start to buzz and make audible popping noise after they have been turned on for 30 minutes or more"

Mvp, I am not an expert on Quads but I have read that the panels can arc or short even if they are not abused. It seems to be a fairly common problem with them.

Maybe someone more knowledgeable can help you out.

Panel would be expensive. Try checking replacing the input bipolar lytic and the small 0.1uf cap somewhere midway between input and the panels. Sorry I forgot. Been too long. That fixed my 989.

The thing is one of the speakers is working fine but the other one seems to be faulty. I could still play my music if I just ignore the soft buzz and pops but will it get worse and affect all the other working panels.
Should I replace all the panels of both speakers or just the faulty ones if I don't want sound quality to be compromised .

Mvp100

What is the humidity level in the room since the noises started ?