FWIW:
A longish entry listing many roles in Kutsch & Riemens mentions Parsifal, Bacchus and Lohengrin and adds: "1922-23 again member of the Berlin State Opera; he now turned more to the heroic repertoire and included roles such as Tannhäuser and even Verdi's Othello in his repertoire."
New Grove Dictionary (1980) says "Although intrinsically a lyric tenor with amazing coloratura agility, Jadlowker began to sing such roles as Tannhäuser and Parsifal, which gradually took their toll."