@fugazikid1991 exciting times, trying out Tube Gear. Sounds like a damaged unit and or defective part in the chain. Doesn’t sound like you did anything at all to cause the issue. You have a 30 day return option so you should be a good spot to decide if you want to try and figure out the issue, repair the unit or send it back.
It’s cool that you ordered your unit from a Charity Shop, guessing the proceeds will benefit those in need, that’s awesome. Most of those types of shops aren’t experts in what they are selling, they get such a range of donated items they really can’t be. Bring that up as they likely plugged the unit in, if it turned on, they figured it was good to go. Possible they didn’t even hook it up to a set of speakers and since it doesn’t have an old school FM / AM tuner, they would have to also have had a source to hook up, along with speakers.
Looked up your unit as I wasn’t familiar with the it, from a design standpoint, looks to be engineered / built based on proven tube amp design. If you end up sending it back, give a look to brands that offer a good network of support in the U.S and have features like self bias and a bad tube indicator. Those features really take the guess work out of Tube gear and some of the maintenance, hassle. Prima Luna one brand that offers these features but there are plenty of others. Enjoy the hobby, enjoy what sounds good to you and take some of the comments you’ll see on posts with a grain of salt. Audiophiles are a strange bread, they can be a little cranky or extremely concocted at times but also can be extremely welcoming, giving of time and really willing to help.
Beat of luck!