On December 16, 2016 at 10:21, highfigh said...
If the plate voltage is higher, how is the transformer NOT increasing the line voltage, whether it's DC or AC? In order for the B+ to be in the 300VDC+ range, the output from the power transformer's secondary must be increased before it reaches the rectifier, where it may/may not pass through without voltage drop.
I suppose I do have a need to comment on the things you write. A lot of them seem just a little off.
What is line voltage? It's the voltage applied to the component. Let's says it's 120 volts. If you step this up or down with a transformer, you then have another voltage at the secondary, but you haven't changed the line voltage at all. It's still 120 volts. Line voltage is the
input, not any output, of a transformer.
| how is the transformer NOT increasing the line voltage, whether it's DC or AC?It steps up the voltage to a new value that comes out of the secondary winding(s), but that voltage and that value are not called the line voltage. It's called, IIRC, the secondary voltage.
2. If you have DC line voltage, you can't step that up or down with a transformer.
See, you're stating the correct general idea -- that voltage is increased -- but you're using terminology that makes it unclear what's happening. For instance, DC out of a transformer? DC out of a power supply, sure, but as we're talking about it that's a transformer, a rectifier, and a filter. DC out of a transformer is like cookies out of a flour bin. Something's missing in the description.
...the rectifier, where it may/may not pass through without voltage drop.
All rectifiers have forward voltage drop. Some people come here to learn, and all of us learn stuff here. "May/may not" is simply not true.
