Variable Voltage Regulator (VVR)

This system controls the power supply voltage of your tube amp so that you can control the power output. See this great website there : http://www.hallamplification.com

Here are a few SPICE simulation to see the effect of the VVR on the voltage.

R2 and R3 form a 1Meg linear potentiometer (I use two separate resistors R2 and R3 for the SPICE simulations). I simulate current consumption with I1 (40mA) and I2 (10mA). Of course, it’s not a real power supply, that would need more filtering stages for preamp …

Quite full voltage (let’s say attenuator pot to 0) :

VVR Variable voltage regulator for tube amps Schematic 1VVR Variable voltage regulator for tube amps curve 1

Mid voltage attenuation :

VVR Variable voltage regulator for tube amps schematic 2VVR Variable voltage regulator for tube amps curves 2

Max voltage attenuation :

VVR Variable voltage regulator for tube amps schematic 3VVR Variable voltage regulator for tube amps curves 3

My implementation on EZ board :

VVR-prototype

Tests (roots !) :

VVR implementation

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