Her er et "seminar" om moderne rørforsterkere tilgjengelig på DVD:
[OFFER] Masterclass Modern Valve Electronics (DVD) - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement
[OFFER] Masterclass Modern Valve Electronics (DVD) - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement

