Quote:
Originally Posted by Electronic M
You missed the part where it is mentioned that the Ballast in the CTC2B (a parallel heater transformer powered set) is used as a DC B+ divider....It has to remain a resistance based divider....Unless of course nick wants to go with LM317 DC to DC regulators. For the drop he'd need at least 4 in series ...
|
The LM317 is a linear voltage regulator, in which case the voltage drop produces waste heat anyway. So you might as well use power resistors. If you have DC-DC converters (essentially a switching power supply) that might work, if there's no RFI from the switcher. But if you want to keep the set as close to the technology of its day, the resistors would be the way to go.
Some TV sets used the audio output tube as a voltage dropper for the set's IF strip.