First, all connections should be secure, including speaker cables. Next, make sure that your pre amp is ON before you turn your amp on, or off (the pre amp should always be in control of your amp). With that said, yes, your tubes will sound better when they are burnt in. I find this process fun, because your system should sound really good when it is "stone cold". As it warms up, you should hear that things start to sound noticably better and better and even better! Usually in 20 to 30 minute increments. So, while you can power up and leave the room, you really miss all the fun. BTW, you should not leave a tube amp powered up and unattended. Enjoy. Happy listening.
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