Per the photo the top spacer does not look like that of any St. Petersburg Svetlana EL34 I've handled, but perhaps production varied.
Can't tell from the pics if the plates are welded of crimped.
All of my Svetlana St.P tubes (including 300B's) had an off white stenciling (not black).
The Xpo-Pul/Reflektor factory tubes I've used (2A3/300B/6922) had black stenciling.
DeKay
Can't tell from the pics if the plates are welded of crimped.
All of my Svetlana St.P tubes (including 300B's) had an off white stenciling (not black).
The Xpo-Pul/Reflektor factory tubes I've used (2A3/300B/6922) had black stenciling.
DeKay