Conclude the Heathkit T4 Guitar Tube Amp conversion series by addressing noise issues on the beam power tube. Discover how adding a large filter capacitor significantly reduces noise, and test an external speaker to rule out distortion caused by the built-in speaker. Learn about adjusting resistance to protect the system and speaker from damage. Follow the process of improving voltage through appropriate resistor additions and permanent component mounting. Enjoy a professional critique of the finished amplifier by Pete from Cornerstone Music. Gain insights into vintage audio equipment restoration and modification techniques for guitar amplifiers.