Same old misconceptions...
No, 6.8v is not fine! Tubes are not disposables! We are no longer living in the 60's, we have no excuse for not supplying the right voltage, to get the maximum possible life from a tube.
The heater's temperature increases exponentially with voltage; the tungsten filament doesn't appreciate.
For example, some new production JJ power tubes are known to fail rapidly if the heater voltage is too high.
No, 6.8v is not fine! Tubes are not disposables! We are no longer living in the 60's, we have no excuse for not supplying the right voltage, to get the maximum possible life from a tube.
The heater's temperature increases exponentially with voltage; the tungsten filament doesn't appreciate.
For example, some new production JJ power tubes are known to fail rapidly if the heater voltage is too high.
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I had the same problem and decided to use a small transformer with a 12.5 volt secondary wired as a bucking transformer to reduce the line voltage. But I had the space to add another transformer. It works well.
Here is a thread for reference:
http://www.diyaudio.com/forums/tubes-valves/204948-effect-high-mains-voltage.html
Adrien.
Here is a thread for reference:
http://www.diyaudio.com/forums/tubes-valves/204948-effect-high-mains-voltage.html
Adrien.
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