suppose your point is that the old & the modern were both 'switchers', so why the problem with one & not the other? Answer, filters. The engineer of the radio HV supply had to make it work in a radio. The LED bulb engineer has to make his supply light a bulb. The LED driver 'switcher' could be made quiet with enough and properly designed filter for the job. Some Tectronix oscilloscopes, the have sensitivities to measure & display microvolts, have internal switching power supplies....all designed with proper filters for the job at hand. It isn't a matter of what can be done, but a matter of what is done. How much do you want to spend?(quoted from post at 22:48:30 09/28/17) While we're on the subject of switching power supplies, anyone remember how HV DC plate voltage was generated in automotive (6V DC) tube type radios?
Yes, it was done without RF/IF interference issues.
Showing my age here.
Dean
he 'similarity' would be in moving contacts making and breaking a circuit. The Kettering ign stores energy in a magnetic field then abruptly releases it, whereas the vibrator alternately supplies power to the ends of a center-tapped transformer, where it is stepped up in voltage at the secondary (now an ac waveform), then rectified to produce HV dc .(quoted from post at 12:52:18 09/29/17) Vibrator power supply was very similar in operating theory to a points ignition system
lot of old things were just built better than a lot of modern things. A Fellow who made a pot of money pedaling "quality is free" to industry in the 1970-80s, convinced almost everyone that they need not define quality the way it had always been. Edwards Deming re-defined quality as "whatever meets the customer's requirements". That meant that if the wholesaler/retailer required a LED bulb design that made light for a day, a week, a year, makes any and all RF noise that the FCC allows, costs 80 cents to manufacture, has a socket base that won't corrode to dust within a month, and whatever else you might imagine, then that my friend is a quality product. Note: for the manufacturer, the customer is NOT the consumer! That would be Walmart or the distributor between Walmart & the manufacturer. I have trashed hundreds of Deming's "quality" products in my lifetime, but like your old pre-Deming radio, I have a receiver used by the U.S. Army during WWII, that I use today to listen to broadcast from around the world. It's capacitors (unlike so many condensers on forum members tractors) & all its vacuum tubes still work. That suits my 'old fashion' definition of quality!(quoted from post at 15:13:52 09/29/17) Well, not really, JMOR.
It was more of a nostalgia question rather than a question of design parameters.
I well remember turning the radio on my Father's 1951 Buick and listening to the vibrator hum for a minute or so until the filaments heated the cathodes enough that the tubes would function and the radio would work.
FWIW, the 1951 Buick was retired in the early 1960s to a spot behind the barn but I would occasionally start it and drive it around on the farm a bit when young. It was not scrapped until the mid 1970s and the Sonomatic radio still worked. The radio had never been out and the vibrator had never been replaced.
Dean
2 volts on the plate?.........just call me a doubter & post proof.(quoted from post at 23:23:46 09/29/17) I think I still have some old vibrators in my junk box. They made a transistor replacement later that was a multivibrator but most did not last long because of the voltage spikes and lack of a heat sink. My 62 Ford Fairlane radio used low voltage tubes that had 12 volts on the plate and transistors in the audio output.
That would work, as long as the cathode was several hundred volts.(quoted from post at 22:42:21 09/29/17) Agreed.
12 V plate voltage!
Cannot imagine.
Dean
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