In an exemplary embodiment, step 906 may be repeatedly performed by successively placing a front side of one of the plates into contact with a back side of one of the plates. For example, one or of plates 115 may be positioned in the fixture with its front side 116 exposed. Another one of the plates 115 may then be placed in the fixture with its back side 118 exposed. In other words, the plates 115 may be successively placed in the fixture with each successive plate having alternating front to back orientations.

In a step 908, a weight (not shown) may be placed on the completed stack to hold the plates together and the plates and the holding fixture may be placed in a furnace (not shown) to simultaneously melt all pieces of the brazing film. In a step 910, flow of molten brazing material may be constrained (e.g. grooves 150 in the brazing tabs 132 or 134 may capture portions of the molten brazing material as the molten brazing material reaches outer peripheries 152 of the brazing tabs 132 or 134. Thus brazing material may be constrained to remain between adjacent ones of the brazing tabs 132 or 134).

In a step 912, the brazed stack of plates may be expanded as shown in FIG. 10. In a step 914, electrical insulation may be applied to unbrazed surfaces of the plates (e.g., the plate surfaces may be anodized, powder coated or varnished). After application of electrical insulation in step 914, the stack may be compressed into a configuration such as that illustrated in FIG. 1.