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n . , • ,I . „ , . r L a |L board used for a credit course at WUNC-TV, Chapel Hill, North Carolina. The chalk board is 4 x 8' e and Mon ^We^k that extends it 15" from the wall. Due to the framework and a 5" chalk tray, the person using the board stands at least 2' from the wall, facilitating back and key lighting and improving camera angles. After aging, the tubes are checked on a SECO Grid Circuit tube tester, which indicates control grid emission, grid to cathode shorts, cathode to heater shorts, and gaseous conditions. Another 5 to 10 per cent of the aged tubes fail to pass this test and are returned for replacement. The remaining tubes are then placed in stock to be used when the occasion demands. Larry Brogger, KUOM chief engineer, has pro¬ mised to furnish us details on the KUOM tube ager which we will duplicate and pass on to you. He believes this equipment will pay for itself in a year’s time by locating sub-standard “new” tubes, to say nothing of the maintenance time saved by knowing that a tube is good before it is used in equipment. Also as a result of the use of this procedure, he has become convinced that an occasional routine check of tubes in operating equipment is advantage¬ ous in maintaining the equipment in peak operating condition. * * * * Others may be interested in the photo on this page which shows how WUNC-TV mounts a blackboard for use on TV. Actually, the board isn’t black; it’s green. The framework was built by their staging facilities people and holds the board away from the backdrop. This feature makes possible the use of back light and also keeps the performer away from the wall so back light is effective. The supporting frame is not covered, as it adds a very pleasing pat¬ tern to the set. I spent some time with Berten Holmberg, chief engineer of KTCA, the Twin City Area ETV Corpor¬ ation station. The KTCA transmitter has been in¬ stalled in the KUOM transmitter house, proof of performance tests have been completed, and they have had a test pattern on the air on Channel 2. Present plans call for programming to begin in September, 1957. KTCA offices are located at present in a tempor¬ ary building on the Agriculture campus of the Univ¬ ersity of Minnesota (which will also house live studio and film equipment). Work is about to be started on the installation of studio equipment. Bert has had his physical activity severely slowed because he tore a tendon in his left heel in an attempt to get away from the KTCA tower when a bolt was dropped. Now that the cast has been removed and the crutches discarded, he hopes soon to be going full speed ahead. * * * * The NAEB Engineering Committee held a short meeting in Chicago Monday, April 8, prior to the NARTB Convention and Broadcast Engineering Conference. Six of the 10 committee members were present. * * * * Speaking of the NARTB Convention, I saw per¬ haps 20 engineers from educational radio and TV stations in attendance. No doubt there were others whom I didn’t happen to meet or see. Total reg¬ istration for the Convention was 2358, with 577 reg- 2 ENGINEERING NEWSLETTER