Hey guys, I need some help, I own a Laney VH100R and it sounded pretty darn good, however one day after I turned it on and plugged my guitar in there was a loud pop and suddenly a major loss in volume and tone. I've checked the back of the amp, and all the tubes seem to be glowing fine.

I used to only be able to only turn the volume knob to slightly lower than 2 however as of late I have to turn it up to around lower than 3 to get the same volume, however the tone is still not the same.

I'm not too experienced regarding such a matter and I hope I've given enough details, if more details are needed feel free to ask, any help regarding the matter would be greatly appreciated.

Thanks in advance.