Tube amplifier guru Pete Millett created a safe, reasonably priced tube amplifier
based on the 12AE6A automotive radio tubes.  They’re designed to run on 12 volts instead of the
hundreds of volts of standard tubes.  From a practical point of view, that means that you can stick
your hands into this circuit and not run the risk of dying from electrocution.

The amplifier circuit that Pete created is a hybrid tube/solid state design.  It uses the tubes as
votage gain devices and a Burr Brown OPA634 buffer as the output stage.  It’s an excellent idea