Little Dot I+Hybrid Vacuum / Solid-State Headphone Amplifier
The Little Dot I+ is a hybrid transistor-vacuum tube headphone
amplifier, which combines the smooth, musical sound of tubes with the
high output current of transistors. The vacuum tube stage is run in
Class-A, the MC33078 operational amplifier (socketed) provides voltage
amplification, and BD139/BD140 transistors serve as output buffers. The
Little Dot I+ is perfect for driving low impedance headphones that
require gobs of current to perform to their full potential. With two
gain settings and DIP switches for vacuum tube rolling, the Little Dot
I+ offers versatility and incredible sound quality in a tiny footprint!
The
Little Dot I+ includes the following tube-rolling options (as well as
their equivalents): 6JI, WE403A/B, GE5654, M8100, CV4010, EF95, EF92,
CV131, and WE408A.