Testing complete:)
Replaced F2 fuse.
C11, Q51, D52L, VR51L, Q6L ond Q9L all tested out equal to right channel.
Your chart was exellent Mark:)
One row of transistors mounted on L all in on R, variac and DBT.
Measurements made:
72vdc +/- on caps and backboards.
0vdc on both outputs:D
15vdc +/-...