Quote:
Originally Posted by josephdaniel
Ok do out of curiosity I turned the brightness up all of the way and turned out some of the lights in my room and I was able to see a faint raster that is off center. Could this be a 6 volt CRT being run off of 2 volts? I didn't see very much filament glow when I looked at the neck of the picture tube. I am hoping that it is just a combination of a weak tubes/aged caps on the PCB
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If that was a 6V heater, it would light up like crazy (since your heater string is constant-current* at .6A, and a 6V heater is rated at much lower amperage, it'd get around 12-15V across it). Hopefully the dim raster is not caused by flat emission in the CRT. If it is, has anybody ever had any success rejuvving those 2.5V jugs?
*Series strings are constant current, while parallel circuits are constant voltage. That's why series strings have tubes with such odd heater voltages all running the same current.