In message <1CC24F32CBEE4F1FA2423EF925160443@PC323541548743>, dated Thu, 7 Aug 2008, 'Rich Nute' <[email protected]> writes:
>The PX4 doesn't seem to have the same reputation as the 2A3. Oh, it does in UK and Japan. (;-) [snip] > >Both take a lot of bias! Gotta have a C battery. Yes, the simplest solution where the valve/tube is directly-heated. But these days, providing a negative rail is easy. In 2A3 days, we didn't have the 6X5 rectifier with a high permitted heater-cathode voltage, so the C-supply circuit needed the mains transformer to have a heater winding as well as a C-supply winding. Of course, you could often add your own windings - the winding space wasn't entirely filled, even with the requisite layers of waxed-paper insulation. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
