• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

GE 6sn7 made in Italy

I need help finding info on this tube.
I picked it up at a local hamfest, It is a black base, tall glass 6sn7gtb.
What concerns me is it has a top getter which is a round or halo type.
Also it is white labeled on glass made in Italy. All others i have used are all made in USA. And no top getters.
Any help or info would be great.. Also date code is SV 188-5. Which from past research should be 1966.
Help please... Thanks