Audio Research I/50

found this:
"Like all modern amplifiers from Audio Research, this one also has automatic bias adjustment, which makes living  with a valve amplifier much easier".
but still, i  would like to have an option to check and bias it by myself from time to time.

the question is why if it has automatic bias , you still have to bias it "by a trained technician to ensure proper operating values."
something is contradicting here ?

That is probably after you install a new tube-set.

i'm planning to ask the distributor here to check this subject with ARC

Interested to hear.