Just met the other problem . Do you have a leaded or non-leaded pcb in front
of you to deal with. ?
Current one a Fender amp, so USA and no RoHS stickers anywhere, but
component date of 2005, so before 2006, so one would assume it was leaded
solder from that info. Not taken apart yet but can see perhaps 10 ring
cracks in the solder around the valve bases, rear of pcb not seen yet. At
this stage I suspect PbF solder