![]() If the grid is at the same voltage as the cathode – or more positive than the cathode – then the tube will conduct as much current as possible. ![]() If the grid is negative compared to the cathode, the tube will conduct less current from its cathode to its plate. It measures every influence with respect to the cathode. This means that the centre of the tube’s universe is its cathode. The grid of the tube is also tied to ground through a resistor, which for practical purposes looks like a direct connection to the bottom of the cathode bias resistor.Īs we say in the TUT ( The Ultimate Tone) series of books, the tube is “cathode-centric”. A resistor is placed between the tube cathode and ground. To understand this, we must first look at cathode bias.Ĭathode bias is also called “self” bias. Q: What is “fixed” bias? If you make it adjustable, is it no longer “fixed”, or is it “broken”?Ī: “Fixed bias” refers to the bias condition with respect to the signal cycle and means that the bias condition of the tube does not change over the signal cycle. ► Tube Matching ► Tube Pulling ► Tube Ratings ► Tube Sockets ![]() ► Technology Availability ► Technology Comparison ► Power Scaling ► Power Scale Switching, ► Power Scaling vs. ► Kit Questions: General ► Kit Applications ► Kit Assembly ![]()
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