The Quagliardi 501+ is a  powerful device  that delivers a clear and transparent response at low and medium gains while adding a distinctive and colorful character when pushed into saturation.
 
Equipped with a permalloy transformer and the legendary 2520 operational amplifier.
 
Additionally, it features a combo connector on the front panel, allowing you to connect an alternate low-impedance XLR or a high-impedance instrument in DI mode.