Definitely PbF used, but nothing obviously wrong in the way of ring
cracks etc.
"digital" checking of caps (with fingers) a Sanwha SD, 47uF 450 V , C16
designation ,would move like that situation of pad and pin fully
soldered over so you cannot see the metal of the pin at all, but there
is movement of the cap as the pin is moving fully enclosed in a PbF
solder "socket". Ground back the solder on both pins to show
discontinuity of metals and still no movement seen. A physical break
inside the cap on one pin of 'D' anode supply to the preamp, of the R/C,
B to E HT chain. I've yet to hear back from owner , how much hum there was.