<[email protected]>, Rich Nute <[email protected]> inimitably wrote: >In the mid-fifties, GE came out with a >transformerless 17-inch TV. One side of >the power line was tied to the chassis >(2-wire plug back in those days). The >only protection was the plastic knob on >the shafts of the various controls. When >servicing this TV, you quickly learned >never to touch the chassis!
We had transformerless sets earlier in Europe, around 1951 IIRC, because we could get at least 200 V B-plus (see, I can speak American!) from a half-wave rectifier. > >The power supply was a simple full-wave >rectified power line. How could you full-wave rectify the 120 V supply? A bridge rectifier? Or was it a voltage-doubler? > The tube heaters >were connected in a series-parallel >arrangement. Another problem we didn't have. In fact, some sets had a 100 mA heater chain, using peculiarly British (Mazda) valves with B8A bases. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk This message and its contents are not confidential, privileged or protected by law. Access is only authorised by the intended recipient - this means YOU! The contents may be disclosed to, or used by, anyone and stored or copied in any medium. If you are not the intended recipient, please advise the sender yesterday at the latest. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
