On switching on my K-4040, the fuse F1, 2.5A, was blown during switching from pre heating to operate. After replacing it by a new 2.5A fuse, it all woked fine and I did use the amp for approx 2 hrs and enjoyed the performance quite a lot. But when I switched off the amp, the second 2.5A fuse blew (with a rather impressive flash)
The amp has worked fine during bias adjusting and some simple tests before, so I think this is very strange.
When I insert a 5A fuse , LD-2 at the front turns red, but LD-1 remains off (front switch in OFF position) As I do not remember if LD-1 should be on as well ( based on the diagram it wouldn’t) but I thought it was on during previous attempts, I am not sure were to start looking.
Any suggestion?
Best regards,
Mark