Plate current on Cary SLP05

Can you guys please enlighten me on this plate current.

As per the manual this is supposed to be 60 mA and I do remember seeing the needle above 50.

for the reason which I am not aware the damn needle stops at 20 now.

Is something wrong with power in my home? or am I missing something here.

Is it safe to run the preamp?

appreciate the help