Quote:
Originally Posted by Electronic M
I'm guessing the 490 has only a switch to set heater voltage.
Different CRTs have different heater current which load the filament transformer differently...my 466 has a continuous heater adjustment knob and you set it by reading the heater voltage on one of the scales of it's meter....a CRT can draw as much current as it wants and you will still be feeding it the right voltage even if you have to set the coarse heater adjustment switch to a higher a range... Some of the low current 6.3V monochrome portable CRTs barely need adjustment of the heater pot, but a power thirsty roundy will need it set fairly high.
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correct, it only has 2 heater settings
https://i.ytimg.com/vi/cidneB0ziYE/maxresdefault.jpg
found the perfect pic on the net!
