Quote:
Originally Posted by old_coot88
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. |
Both the 2.35 and 6.3 volt CRTs use 600mA of current. When replacing a 2.35v CRT with a 6v one, it was commended to short out a section of the big filament dropping resistor to compensate for the four volt difference. However, since AC line voltages are typically four or more volts higher now, I wouldn't do it.
I've tried rejuvinating a couple original 2.35v 21EAP4s with no luck.