An electron tube is provided with a plurality of supports, a portion of the support covered with conductive material abuts the inner wall of the shell, and another portion of the support covered with dielectric abuts the helix. The first readout register includes a plurality of first readout register elements. Therefore, a modulator sequentially receives output from the comparator of each block for generating the final output y. The method also includes at least the following steps: sample vector formation step, in which samples are taken from the received signal for forming the sample vectors, p. The personal news server filters newsgroup information received based on subscription information stored only local to the receiver. Finally, dicing is conducted to obtain a separated semiconductor device as a final form.