Quote:
Originally Posted by Tim
On to my next question.
I wouldn’t have thought the EHT would requires much current. Probably microamps I would have thought sizing the secondary wire/size of a transformer for two or three milliamperes should be fine.
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Beware that the required current can tot up somewhat- whilst the CRT beam current itself may only be a few tens of micro-amps at full brighness, more is lost in the acceleration process to the gun electrodes, then the brightness/focus resistor ladder typically takes a few hundred micro-amps, the regulator's feedback sampling chain typically a similar current. Then there's the correction coefficient for the peaky current taken by a doubler and the doubling itself. I recently had Ed make up replacement for a Hameg 'scope with a transformer winding feeding a symmetrical quadrupler for EHT, I reckoned that the winding rating amounted to around 7mA in the end.