In article <OFEE297F53.A941FA51-ON88256F33.005BCE4D- [email protected]>, [email protected] writes >For Europe (230 volts), I would expect that lamps up to 60 watts would >be vacuum, and lamps of 100 watts and great would be gas filled. Or >perhaps they are all gas filled to suppress Barkhausen oscillations >driven by the higher power line voltage.
I believe so. It would be interesting if you can get an elderly (so that there is a metal layer on the inside of the envelope) 120 V lamp to oscillate. They go better if you put VHF r.f. chokes in the supply leads. Touching the envelope can start or stop oscillations. I'll try to find the original report from more than 50 years ago. -- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Scott Douglas [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.ieeecommunities.org/emc-pstc
