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*** The Ampliphase Ancestry *** KOH 630, Reno, Nevada, 5KW Homebrew, 1951 KOH was owned by McClatchy Broadcasting, who also owned KFBK in Sacramento, KBEE Modesto and KMJ Fresno. The May 1951 issue of "Electronics" magazine features an article, written by Norman D Webster, entitled "Economical 5KW Am Transmitter". It describes in great length the design of a homebrew 5KW outphased Tx at KOH in Reno. Several references are made to an existing 50KW design at KFBK, at which "several years of operatng experience" proved the "feasibility of screwdriver tuning adjustments". The article included a complete schematic of the transmitter, which is reproduced below. The design used a single phase modulator stage, followed by a tripler, unlike the original KFBK which used three cascaded stages. Note the use of 4000 ohm Rc between the grids of the power amplifiers stages. This absorbs a greater amopunt of powe as the grid drives move substantially out of phase, thus reducing the drive level when little output power is required. Also, at the instant of minimum output, the plate load will appear very high impedance, and little power needs to be generated. The KFBK designed used a "rather complex vacuum tube RF voltage regulator", in much the same way as RCA's Ampliphase models when they were released a few years later. The article concludes with acknowledgements to F.E. Terman, Oswald J. Villard of Stanford University and William E. Evans for their assistance in the development of the transmitter. It is interesting to note that KFBK in Sacramento later installed a BTA-50H, approx 20 years after they built their own. That ampliphase is still in use today as a standby unit, having been replaced in the late 80's by the first Harris DX50 digital transmitter, serial number 1. KOH (Newsradio 780, actually KKOH, Reno), The current 630 in Reno is KPTT Sport, website unknown. Also KFBK 1530 Sacramento and Nevada Radio history pages and museum. [Back to the Ancestry page]