Peavey 410 classic ser#8a-253149 needs foot switch

Our new VT Series Classic is the latest version of the ever-popular tube type Peavey Classic. ... innovations incorporated into our larger and more powerful amps. ... utilizes an entirely different type of reverb unit and associated drive circuitry and ... distortion effect is mixed with the clean signal when in the Automix mode.

We don't do that here, I think.
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250V 8A SL(Slow-Blow)

Classic case of switch failure. Before you do anything, get a can of aerosol contact cleaner and spray it into the space between the switch and the faceplate - the cleaner needs to go inside the switch; then push the button several times to try and clean the contacts. That may solve your problem. Good Luck

What do you mean they "switch off"??? If the heaters in all the tubes go out, check the fuse for the heaters, F2 and its fuse clips/holder.

There really is nothing in the circuit to make them "switch off"

If the heaters in the EL34's "switch off", the other tubes should go out as well.

There MAY be a circuit trace on a board that is cracked OR a poor soldered connection. It is vibration sensitive as you have found. Changing a switch vibrates the unit.

Depending on what you have connected, this could even ba a bad input jack.

The unit needs to be serviced. You could open it and see if there is something obvious.

Go to www.peavey.com/asstes/literature/specs/005584220_3.pdf. Apparently the 410 TVX can be used in 4ohm or ohm configurations just don't drop below 4 ohms and make sure your amp has the minimum required impedence. Hope this helps.