This American made non-inductively wound (like a humbucking guitar pickup...), gold anodized, finned beauty is the best cathode resistor for single-ended amp projects that we have ever seen. Expensive but 'worth it'. Bolt it down to your chassis and I bet it will give you a lifetime of good service. 880 ohm 50W is a very popular value for 300B single-ended triode tube amp projects.