Yes, you can blow the reverb drive transformer and/or the driver tube like this. Remember that it's a small tube power stage and like any tube power stage it must not be run with no load.
If you must do it, you need to add a 10-ohm, 2W resistor across the reverb send connection. The best way to do this is to make a box with the resistor in it, plus a couple more to act as a level pad for it, so it won't be so loud and noisy. The box just needs RCA connections (either captive cables or jacks) and it replaces the reverb tank.
