Menno van der Veen's "Designing Tube Amplifiers," published by Elektor, offers a modern, engineering-based approach to valve circuit design, emphasizing grid stoppers, proper filament grounding, and precise, high-fidelity signal paths. The design process, which requires high-voltage safety measures, focuses on specific operating classes (Class A/AB) and optimal output transformer matching. For more details, visit audioxpress . audioxpress - Mod Electronics