|
I think using 8v on the filament for short periods of time every now and again can help "wake up" a tube that is going weak. It seems like the improvement would last for a week or so before needing to do it again. If the effect does not seem to last after returning to regular fil voltage then you could just leave it on the 8 volts all the time but this will make a filament burn-out more likely.
It should work on the electrostatic tube but I am not sure how rare of a tube this is so be careful if it is hard to replace.
One very gentle technique involves using a variable transformer ahead of a filament transformer, or a variable DC power supply. Start out with 6.3 volts and then measure the fil voltage and increase it gradually towards 8 volts and see how the tube improves.
Using the boosted voltage temporarily and then returning to normal can help burn off trash accumulating on the cathode sleeve and thus help emission.
|
01-18-2006, 10:34 PM
Threaded Mode