Several types of block-form porous tablets of carbon nanotubes are fabricated to use as polarizable electrodes in electrochemical capacitors (ECs). These tablets are prepared by using moulded mixtures comprising carbon nanotubes and phenolic resin powders. Comparison of the effect of different processing on the performance of the capacitors is specifically investigated. Using these polarizable electrodes, ECs with a specific capacitance of about 15 to 25 F cm(-3) are obtained with 38 wt.% H2SO4 as the electrolyte.