Quote:
Originally Posted by jcmjmp
I'm saying that you're partly right. By pulling more current out (via the choke) of the power supply, the voltage will drop. The choke doesn't drop voltage, it just demands the current that is needed and the changes in current demand are filtered by the choke. The dynamics of voltage sag with a choke vs a rectifier tube or reducing voltage filtering are not the same. That's what I'm saying.
A resistor is not a choke, its just a resistor.
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That's what I thought you meant.
A choke is not a load and does not demand current.
Valves demand current which flow from the power supply through the choke or power resistor. Chokes have a low DC resistance, usually lower than a power resistor, and so the voltage to the screens and preamp will be higher in the same amp
The dynamics of how sag happens with a power reswistor choke and valve rectifier are exactly the same; valves draw more current from the power supply which drops voltage across any resistance in it's path.
The only difference between the two is that the valve rectifiers sag affects the power valve plate voltage too, the choke or power resistor only affect the screens and preamp.
A power resistor in this position is performing the function of a choke. The word choke does not explicitly refer to an inductor, it refers to the function.