Audio Research VT100 MKll Stays on

If that's not switch than there must be capacitor-relay issue.
The capacitor-relay is usually implemented to prevent from shock. The switch connects to low-voltage circuit that engages the high voltage circuit.
Plugging and un-plugging your amp is much better solution than keeping it on all the time.

Terrybaggit - Demand a refund of any and all tuition you might have paid to learn English.

Thanks everybody for your responses I think I will contact ARC Service

Bpoletti,
That's very similar to what rednecks would often say to foreigners making spelling, grammar or verbal mistakes especially when they have nothing else to say.

Similar money back story:

A pupil who once graduated pricey private high school in London decided to claim money back claiming he did not learn anything.
Priincipal decides to put series of exams to check if that's really the case.
Every school subject he would fail: science, reading, literature, history, but at the end, in the math exam the math teacher asked him how much school has to return his money back.
Pupil expressed the amount in terms of amount per month; number of semesters and number of months per semester.
Math teacher proudly put grade A to his knowledge of math and dismissed pupil's claim.