I'm not sure if my amp qualifies as Vintage, as it's a 90's AC15TBX. Let me start off by saying I absolutely love this amp =).
Anyways, about a month after buying it from the previous owner, I noticed the lamp infrequently flickers. If I just tap the Area next to it, it comes back to full intensity. Also, if I switch it to standby, many times the lamp is fully lit again. Some weeks this doesn't even happen. My best guess is a loose wire or bad joint. Is this something I should be concerned about? Thanks fellow seekers!