Quote:
Originally Posted by bandersen
Not sure what you mean by that ? Is there some device providing a slow 11 second filament power up ?
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On the 25DN6 tube data sheet they talk about controlled warm up period.
"Thermal characteristics of the heater have been controlled such that heater voltage surges during the warm-up cycle are minimized provided it is used with other types which are similarly controlled."
Then further down on the data sheet it states:
"Heather warm-up time. (Approx.)" 11 seconds
Most all of the tubes used have these statements in their data sheets.