Little Dot MK III Introduction
Thank you for purchasing the Little Dot MK III vacuum tube headphone amplifier! Hope this manual can help
you easily enjoy your Little Dot MK III’s sonic capabilities.
Before you use Little Dot MK III, please read this manual carefully. If you have some other problem, please
contact us or visit our website
Little-Tube, and we will answer all your questions as soon as
possible.
The All-New Little Dot MK III succeeds our Little Dot II++ by improving upon it in every possible
way. Boasting the highest stability and sound quality yet, the sound-stage realism and imaging precision
have improved dramatically over our previous amplifiers, and even at high volumes the Little Dot MKIII
delivers a smooth, non-fatiguing sound with no hint of dynamic compression or imaging fuzz. Of course the
liquid warm midrange tube lovers expect is here in spades, balancing right in with a dynamic low-end and a
sweet, airy treble. Tracking precision with low distortion is provided by an ALPS-16 potentiometer, and
Rubycon, German WIMA and ERO capacitors ensure the internal circuitry is built with quality in mind.
The Little Dot MK III also adds in user-tweaking options such as two gain switches to delivery maximum
compatibility with all your headphones, regardless of impedance or sensitivity. Also available for the very
first time in a Little Dot amplifier, is an internal jumper to allow use with a wider range of driver tube-rolling,
including the EF92, EF91, CV138, CV131, WE403A/B, GE5654, M8100, CV4010, EF95, 6JI as well as all
equivalents to these vacuum tubes!
Little Dot MK III Technical Specifications:
Frequency response: 12 hz~100 Khz (-1dB)
THD+N: 0.15% (80 mW @300 ohm)
Power Output:
350 mW @ 300/600 ohm
300 mW @ 120 oh
100 mW @ 32 ohm
Variable Gain: 3,4,5, or 10x
Recommended Load Impedance: 32 ohm~600 ohm
Pre-Amplifier Output Impedance: 10K ohm
Pre-Amplifier Gain: 3-10x (also controlled via gain switches)
Pre-Amplifier Voltage: 10V RMS
Pre-Amplification circuit includes both driver and power tubes
Driver Tubes: 2x GE5654
Power Tubes: 2x Soviet 6H6PI
High quality aluminum chassis
Dimensions (Metric): 270mm deep by 175mm wide by 123mm high
Dimensions (English): 10.6 inches deep by 6.9 inches wide by 4.8 inches
Weight: 3 Kg or 6.6 lbs
Little Dot MK III Gain Control
The Little Dot MK III has two internal, red DIP gain switch boxes, which controls the gain of the amplifier.
You can access the gain switches through the center oblong hole on the bottom of the amplifier. Please
power off the amplifier, and unplug it for at least 10 minutes before attempting to change the gain settings (to
ensure capacitors have fully discharged).
Each red box (that has two switches on it) controls the gain for its particular channel. Under most normal
circumstances, you would want the same gain in both channels so please remember to configure the
switches on each red box identically with respect to the other:
Switch 1 Position Switch 2 Position Gain Suitable For
OFF OFF 10 High impedance headphones
(300+)
ON OFF 5 Medium impedance/sensitivity
OFF ON 4 Medium impedance/sensitivity
ON ON 3 High sensitivity headphones
Note: The gain settings also affect the pre-amplifier output.