The Stereo Amplifier Two (SA2) is the follow-on to the spectacular SA1 amplifier. Much refinement, testing, and tweaking occurred in creating this more powerful and beautiful sounding tube amplifier. The design is an extension of ‘keep it simple’, but with more power output and user features such as: triode or ultralinear operation, stereo or monoblock configuration, adjustable global feedback control and the magic eye tube output level meters with selectable brightness control.
The SA2 uses a differential pair 6BQ7A (NOS GE JAN) input tube connected to a differential pair 6SN7GTB (NOS GE), which then drives the KT88/KT90/KT120 output tubes in a push-pull Class AB ultralinear configuration. Adjustable global feedback can be tailored to provide audio reproduction qualities having more powerful and punchy low frequency extension, or add more ambiance to the midrange with slightly more warmth. The sound quality is everything one would desire in liquidity and ambiance using vacuum tubes, and still delivers the bass slam or impact heard in solid state amplifiers. With a flip of a switch, triode mode can be selected adding the warmth only triodes can deliver. However, if it is preferred to have less warmth, then switch to ultralinear for clean, articulate music reproduction. Lastly, if more power output is required, there is a monoblock switch to convert the stereo amplifier to a monoblock amplifier.
Each SA2 is hand built by Mike McGary using point-to-point wiring with tag construction, quality components throughout, and thoroughly tested before it goes to the consumer with a lifetime warranty.