Post subject: Re: AC Voltage Control for "Light Socket" Radio Sets
Posted: Mar Wed 21, 2012 11:50 pm
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Joined: Apr Thu 02, 2009 7:32 pm Posts: 793 Location: South Western Ontario Canada
To dsen333v, Thanks for sharing . Nice job on the line voltage control. Thanks for the update and testing the line voltage both ways. This has been a very interesting thread. Bob
Post subject: Re: AC Voltage Control for "Light Socket" Radio Sets
Posted: Mar Fri 23, 2012 1:56 am
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Joined: Jun Wed 01, 2011 9:05 am Posts: 6736 Location: "Amish Country", PA
Stan, straight line voltage is a HUGE concern with our antiques today. Fact is, most service is actually 125 volts rather than 120, and in some cases, it is 127. Mathematically, 125 volts is ~14% over-voltage of 110. That's a huge number for electronic equipment. You can extend this even farther by the fact that a '110 volt' radio will still fuction perfectly fine at 107, 105 and even 104 volts, as was the standard around the turn of the century.
At this maximum, you're looking at 19% potential over-voltage. Contrast that with the fact that the recommended window of voltage for 'fine' electrical things like radios and fans is +/-5% of the rated voltage. That would mean that the window for 110 volts would be ~105-115 volts.
Post subject: Re: AC Voltage Control for "Light Socket" Radio Sets
Posted: Mar Tue 05, 2013 4:43 pm
Member
Joined: Apr Thu 02, 2009 7:32 pm Posts: 793 Location: South Western Ontario Canada
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I found this info in in a FTR book that I found from info provided in this thread. viewtopic.php?f=2&t=217584 It provides some interesting info on reducing filament voltage to increase life span of tubes. I thought some members might find this interesting.
