The ornamental design for a tablelampbase, as shown and described.
FIG. 1 is a perspective view of a table lamp base showing my new design;
FIG. 2 is a front elevational view of the table lamp base, the rear and
both side elevational views being identical;
FIG. 3 is a top plan view of the table lamp base; and,
FIG. 4 is a bottom plan view of the table lamp base.
The broken line showing of the lamp shade, the light bulb, the socket, the
harp and the finial in all the figures is for illustrative purposes only
and forms no part of the claimed design.