How to identify a tube in the ecl/pcl range ???

[kagliostro]

Yesterday I've find in my stock about 10 tubes I got 7 years ago

they are surely NOS, selled without a box (if I remember correctly I payed it really on the cheap)

They are surely triode/pentode tubes but on it there isn't a standard Tube Label, only a number

My memory is I got it as ecl8* or pcl8* tubes but I don't remember if they are the 82 or 84 or 86 models, may be pcl86 but not sure at all 


What can I do to identify it correctly ? (I've an emission tube tester to perform measures, the other one that can measure gm need some manutention)

Many Thanks

Franco