Amazon.com: Grundig Eton Digital G8 Radio (NG8B Compact 4 Band World Time Radio) - Battery or Mains Electric (optional) - Compact / Portable - Headphone Socket - Digital Display - AM, FM,
Grundig Concert Boy Radio Overview & Repair. Retro Tech - YouTube
Reference for Grundig Satellite 3400 repair shop. : r/shortwave
Grundig Concert Boy no sound fault repair - Radio Retro