/topics/300b/ Recent content in 300B on Decades of Musings on HiFi Hugo en Mon, 12 Oct 2026 00:00:00 +0000 /articles/edison-60-to-300b-pse/ Mon, 12 Oct 2026 00:00:00 +0000 /articles/edison-60-to-300b-pse/ <p>This 300B Parallel Single Ended (PSE) amplifier is based upon the Edison 60 amplifier kit, which is made in the UK. This modified version uses the PCBs from the Edison kit with only minor changes. The biggest changes are in the PSU.</p> <p><figure class="fig"><a href="edison-300b-front.jpg"><img src="edison-300b-front.jpg" alt="Photograph: the finished amplifier, a polished steel and black chassis with wooden side cheeks, two 300B valves and two small driver valves per side" loading="lazy"></a><figcaption>The converted Edison 60 with four 300B output valves.</figcaption></figure> </p> /articles/single-ended-valve-amplifier-theory/ Tue, 06 Oct 2026 00:00:00 +0000 /articles/single-ended-valve-amplifier-theory/ <p>While much practical information exists with regards to the Circuits for such amplifiers, I have noted that very little has been done to systematically research the interactions between Input, Driver and Output stage as well as the power supply. In the end, we want to design and use the best possible circuit for a directly heated triode. This is not a simple or light-hearted undertaking.</p> <p>From here on it might get a bit mystical, but bear with me&hellip;.</p>