What Is A Plate Load Resistor

In this video i demonstrate how to swap the plate load resistors on a guitar amplifier. Local negative feedback cathode degeneration is caused by the cathode resistor.

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This means that it is better to use metal film for plate resistors.

What is a plate load resistor. There are limits however. Metal film is typically used nowadays for a plate load resistor instead of the old carbon comp. The cathode resistor appears in series with the plate load impedance in the voltage gain equation.

The same thing happens when a tube is operated with a plate load resistor rp its rp value is loaded in the same fashion as resistance b loaded resistance a in the example above. Load resistor in particular is heavily used during education to allow you to mathematically model circuits. Metal oxide is used for screen grid and power resistors.

The danger of such a light idle current lies in the dragging down of the high frequency response due to the circuits inability to charge the load and stray capacitance. For unbypassed cathode resistors. The b or plate supply voltage available to the tube is in effect reduced by the magnitude of the bias voltage.

So the voltage drop across the plate will change when a series resistance is added in the plate circuit. There is around 1 to 2 ma of current flow in a typical plate circuit but the grid current flow is practically negligible. Unless we are willing to use an extremely high power supply say 1 kv we must accept a mere trickle current to accommodate a plate resistor that equaled 20r k.

Gm is a way of figuring out how much a change in grid voltage will vary the plate current and change the load voltage across the plate resistor. Carbon film is frowned on by the boutique amp dudes. Also since resistor noise is proportional to current flow a 100k grid resistor is going to be quieter than a 100k used as a plate resistor.

Any changes in ip will be reflected in the voltage drop across the load resistance. Load and load resistor in particular is a vague concept intended to focus function on the objects in question and is always referenced back to something that is driving said load. Im working on a marshall jmp however the techniques i discuss can be applied to many amplifiers.

For instance operating a 12ax7 rp 625k ohm with a 100k ohm plate load resistor produces a circuit gain of only 615 not 100.

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