... blank panels; transformers; diapragm aamp; voice coil assemblies; horn throats- a Voice of the Theatreaquot; speaker systems; amplifiers; ... SYLVANIA ELECTRlCa Increased prices of all sub-miniature tubes except GAD4, 6BA5, and 6K4. ... _ G. E.aaAdded dual stylus assembly No. ... ]FDa-For use with open wire transmission lines, a new lightning arrcstor No. ... In addition to the TEK-FILE listing, the index contains simplified instructions on how to file TEK-Fl LE in a filing cabinet or binder.