[Amps] Need Svetlana 3CX2500F3 Info

[w2cqm at juno.com]

Building up a RF deck around a hamfest purchased  Svetlana 3CX2500F3
tube. Would like to determine which one  of the  factory bonded  HD
filament cables is  internally attached to the cathode. One cable extends
directly from the bottom and the other is attached to the next higher
ring (and offset on one side)  on the tube. All attempts at e-mail to
Svetlana bounces. Any help would be appreciated. Thanks, Ron W2CQM/3