gtr777Manuals and User Guides for Sony HCD-GTR777 HCD-GTR888. We have 1 Sony HCD-GTR777 HCD-GTR888 manual available for free PDF download: Service ManualHCD-GTR777, GTR888: E2, E51, AR 4-265-401-0[] Soldering irons using a temperature regulator should be set to HCD-GTR777, GTR888: MX 4-265-401-2[] about 350 °C. Caution: