The lower you go in frequency, the closer the you get to direct current as the coil sees it.A coil wound for 60cycles (as these are)will draw more current on 45-50 cycles because the field hangs up longer before the next wave cancels it out.ChuckA wrote:Russie,startgroove wrote:To answer a previous question, the reason for offering two difference ballast tubes back then has to do with the line frequency and line voltage. UV876 is for a range of frequencies a little above and below 60 Hz, while the UV776 is for line frequencies below 50 Hz. (45 Hz was a line frequency that was infrequently employed in parts of the country back in the day. The lower line frequencies, when applied to a transformer that is wound for 60 Hz, don't allow as efficient a transfer of energy, hence the lower resistance of the UV776.)
Can you post or point to the data sheet you are using to explain the function of the ballast tube in regards to its frequency characteristics?
As far as I know it's a simple current regulator that regulates the output voltage based on current draw, nothing in regards to the frequency of the incoming voltage.
Chuck
therefore the ballast has to be rated to compensate for this