No, it should be reasonably quiet. But have someone who knows amplifiers listen to it, I have no idea how your expectations match up to the amp.
If it is excessively hummy it could be from weak or bad power tubes - I suspect someone selling the amp didn;t invest in new tubes for the sale. There could be cracked solder to the power tube sockets. The tubes could be fine but terribly mis-matched.
Or a preamp tube could be hummy. Your power transformer mounting hardware could be loose.
The 100 ohm resistors that balance the neater supply could be burnt open.
The list goes on, unless you are technical enough to demount the circuit board and solder components on it, I suggest you take the amp in for service. If you have such skills we can help further.