Introduction
This issue of Elektor Special Project focuses on vacuum tubes ("Röhren"), exploring the blend of old and new technologies in electronics.
Image description: Two vacuum tubes are shown. One is a larger, cylindrical tube with visible internal elements, and the other is a smaller, more compact tube.
The article "Old and New in Harmony" reflects on the evolution of technology, from early mobile phones to modern smartphones, questioning the necessity and benefit of every innovation. It poses the question: "Is every innovation, based on technical progress, also sensible and desirable?"
Image description: A detailed view of an electronic circuit board featuring several vacuum tubes, along with various resistors, capacitors, and wiring. The components are arranged in a complex configuration, suggesting a functional electronic device.
The issue highlights a specific project: "Quiescent Current Control of Tube Amplifiers with a Microcontroller." This article describes a symbiotic approach where a microcontroller ensures tubes operate within their safe working range by continuously monitoring and controlling the quiescent current. The author notes that this is an instance where a computer genuinely assists rather than adds to the workload.
The text also touches upon the significance of virtual social networks and how direct human communication is increasingly mediated by digital devices. It contrasts this with the enduring value of face-to-face interaction, particularly within the "tube community," citing regular meetups in Mühlheim an der Ruhr and Munich where enthusiasts share new designs and experiences.
Elektor Publishing utilizes both traditional and modern methods to reach its audience. Online seminars, or webinars, are popular, offering in-depth information from Elektor Experts on interesting projects. Additionally, "ElektorLive!" is an event where developers and authors engage directly with visitors. Further information on previous tube issues (1-7) is available on the Elektor website.
By Rolf Hähle
Contents
Fundamentals
- 6: The Compression Effect or the Secret of the Screen Grid
- 14: Phase Inverter Stages
- 21: Grid Resistance and Grid Current
Practice
- 26: Single-Ended Class A Amplifier with the 6C33
- 38: Single-Ended Amplifier with the Legendary 300B Tube
- 48: Single-Ended Amplifier: A Handful of Good-Sounding Watts
- 54: Parallel Push-Pull Monoblock with 140 Watts
- 62: Quiescent Current Control of Tube Amplifiers Using a Microcontroller
- 66: Compact Stereo Tube Amplifier with the ECL 85
- 70: 2-V-1 Audion for Medium and Shortwave
- 74: Hi-Fi Tube Amplifier
Technology
- 80: The Sound Secret of Oxygen-Free Copper Cable
- 84: Stereo Bass Width
Info
- 4: Seven Years of Elektor Tube Special Issues
- 12: Advertiser Index
- 88: Tube Data with Socket Diagrams
- 90: Imprint
For more information, visit www.elektor.de.
