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It APPEARS that the preamp tube heaters are run from DC source while the latter ones and the power output tubes are run on AC.
Check the 6.3 volts AC going to the power amp tube.
That heater power is fed through fuse F2.
I suspect you will find that fuse has a bad fuseholder or is blown. A failure in the transformer is possible and I hope that is not the case.
A heater short in a tube is possible but doesn't happen often. Replace the fuse ONCE only and if it blows again investigate why. Could be bad wiring or a bad socket or an internal short within one of the unlit tubes. Thoose are rare but still possible.
It sounds as though you are pointing the peavey at the band in a practice situation? If so make sure that each speaker is at about 60 degree angle to either side of the back of the mike (you facing the speakers), most mics reject feedback when the the user is directly in front of a monitor, but Beta 58s' tend to feedback more in that situation. Alternatively (if it is a practice room situation), why not place the speakers behind the band at 60 degrees each and turn to face the band.
The Peavey A/B controls are output gain controls. Your mixers stereo output goes into the amps inputs, channels A & B. The Peavey is the output stage to your speaker system. If you you connect the outputs from a power amp to the inputs of a mixer you will blow the mixers input stage, amongst many other things and possibly damage the amplifier too. The bias (Bass, Mid, Treble controls) are on the mixer, not the amplifier. Unless you are using a mixer amp, which you are not. A PA system DOES NOT work in the same way as an intergrated hi fi amp.
Open it up check the back of the switch.
if its disconnected or poorly connected re-solder it if that does not work, or you dont know how to; get a new switch
[you can easily get them at the Source or some electronics store]