When considering a tube power supply, I thought everything was great as long as you have adequate voltage and amperage. With this idea in mind, I replaced a power supply for a Musical Fidelity X10 V3 unit. Next thing I know the unit is pissed at me and blows the output transistors(it is a hybred unit). Then, no voltage on the rails. But the strange thing was, after I replaced the abused transistors, voltage was back. Of course, I don't have a schematic so shootin in the dark is the norm here. And when I measure the power supply disconnected from the circuit, it reads 14V (it is center tapped, and both sides read good). As a parting note, I will admit that there could easily be something amiss else where, since I replace almost every component in this unit, thinking it would be golden afterward.