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I have increased the heater voltage to bring back old tubes, especially ones that had not been used in years. The normal filament voltage is 6.3. I usually use around 8 volts. Most TV parts suppliers sell brightners that can be soldered between the filament winding of the flyback and the CRT filament that will boost the filament voltage.
Before you buy a brightner, connect an 8 volt source to the filament and let it cook for a half hour or so. Then, remove the power source and connect the CRT for normal operation and see if it looks better.
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11-06-2008, 11:59 AM
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