I know that vox ac30's and other PTP amps have been around and functional since 1960's. I'm fairly new to amps and I find that really amazing. So I was wondering... can the newer vox ac30cc or any current pcb tube amp last for such a long time with constant use (assuming that it is properly taken care of)? Will the pcb eventually fail? I have a vox ac30cc and I'm sure it will have maintenance issues as I'm sure PTP amps will.. that's all fine. I'm just wondering if this PCB amp will still play after 30 or 40 years down the road.