Yellow paint
Trapezoidal-shaped getter support
Each plate is made of a single piece of metal, folded and crimped.  Note that these plates are a very shiny black.  Otherwise, construction and appearance very similar to RCA "blackplate" tubes.  Plates are vented by slots at the top and bottom of the center portion of the outer half of the plate assembly.  The inner halves (toward the center of the tube) are not vented.
Note small "12AX7" painted near top of tube, unlike the etching or paint on many other Sylvania tubes.