The old Acoustic brand produced by Acoustic Control Corporation was bought out by the Guitar Centre chain of music stores in the USA. The new versions are made in China and bear little resemblance to the original units. Some folk quite like them others not so much. You'll likely find more about this on an American forum such as Talk Bass.
Take the amp to an Ampeg Service centre and get it repaired.
Do the battery test on the speaker system to see if you actually blew the cabinet and not the amp.
If you don't know what the battery test is: connect a speaker cable to the cabinet. Connect the plug on the opposite end across the terminals of a 9V battery. If the cabinet is good you should hear a hearty thump from it.
Hey Paula that's a cue for a song! LOL
When I first arrived in Toronto I thought Pete Traynor's amps were aimed at beginners as in Trainer.! LOL The Yorkville plant is just up Kingston Road from my house. They make good reliable equipment.
When the Pandemic is done with I'm hoping to get a tour of the plant.
VOX, Jennings Musical Instruments, were authorised to use the Beatles name. The companies that bought VOX were disappointed when the right to use the Beatles name didn't come along with the purchase.
No problem handling B9A pre-amp tubes with your fingers, They don't get hot enough for the oils on your fingers to make a difference. Even output tubes won't be bothered either. They are not like headlamp bulbs.
What you may not know is that the brand 'Acoustic' was purchased by the Guitar Centre chain of music stores. Since the purchase the brand has been made in China and bears little in common with the ACC of old.
My worst experience in bass amplification was a 50W Blackface blonde Bassman with it's 2x12 cabinet in the late Sixties. It looked wonderful on stage but sounded like a pile o' crap. I had to use it for the two gigs that weekend in Liverpool and then returned the amp to Dawsons in Runcorn. Unfortunately they had sold my trade in so I just left the amp there. I still get nightmares about the damn thing!!