Bias Tube Amp Circuit Diagrams. It uses a set of probes that are plugged into the tube sockets and the tubes are then plugged into the probes. This circuit is located in fig.
Solving for i we get. Connect the negative black probe from the multimeter to the negative speaker binding post of the amplifier. The tube can stop the flow completely called cutoff or let it flow at maximum.
Complete circuit diagram of 50 watt amplifier using kt66 valves with fixed bias.
Rseries rshunt 032 ยต 1 for example if the bias adjustment circuit amounts to 20k to ground and the mu of the power valves. P is the power rating of the power tube i is the bias current and v is the plate voltage of the power tube. Connect the negative black probe from the multimeter to the negative speaker binding post of the amplifier. 41 output stage or power stage.