The model 422B CENTURION uses the classic pair of 3-500Z tubes. The RF deck and power supply are combined into a single, attractively styled, black desk top cabinet. The power output is rated at 1300 watts on SSB and CW and 650 watts using "key-down" modes. Drive required for full power SSB operation is 100 watts. The CENTURION operates on all bands (including WARC) from 1.8 to 21.5 MHz. 21.5 to 29.7 MHz is enabled with user installation of an expansion board, supplied at no charge upon proof of licensed authority.