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The most reasonable place for a new speaker is Seismic Audio https://www.seismicaudiospeakers.com. If you don't care for that, look for an Eminence Delta series. You'll need to check your amp for what ohm speaker you need.
Do not mess with this yourself. Take it to a repair shop. The switch needs to be replaced, at a minimum and possibly other parts. There is lethal voltage involved in a tube amp.
if you turned it on without speakers hooked to it you may have blown the speaker output amps or if the end of the amp remote wire touched a ground you may have burned a trace on the board did you here it play at the pawn shop? or did it just light up? sometimes the people at the pawn shop think if the unit lights up it is working and sometimes they check them is just hook power to them without speakers if so this can blow the speaker output I would take it back to the pawn shop
I just fixed my bass amp with a similar problem last week: the problem is related to a loose connection on the PCB board (likely).
A bass amp is a rough place for circuitry: the low rumble and power shake a bass amp more than a guitar amp.
In my case, the power transistors needed to be re-soldered and then the grounding bolts and screws needed to be removed and cleaned because the connection was bad. Remember that when two different metals needed for an electric connection are toughing, there is the likelyhood that corrosion WILL happen.
My bass amp did basically the same thing yours did: sounded good at low volumes, but at higher volumes it would act up.
In short, there is nothing you can do (unless you are a repair person): you need to take it to a local music shop and have a tech fix the intermittant contact problem: someone who knows what they are doing should only take an hour at most.
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