Little Dot MK III Reference Manual
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Little Dot MK III Reference Manual

Headphone amplifier/pre-amplifier
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Little Dot MK III
Little Dot MK III Headphone Amplifier/Pre-Amplifier
Reference Guide
Version 1.2
Last Updated 10.17.2014
The latest version of this Reference Guide can always be found
here
1

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Summary of Contents for Little Dot MK III

  • Page 1 Little Dot MK III Little Dot MK III Headphone Amplifier/Pre-Amplifier Reference Guide Version 1.2 Last Updated 10.17.2014 The latest version of this Reference Guide can always be found here...

  • Page 2: Safety Notice

    7． Amplifier may be hot during operation. Do not touch vacuum tubes or chassis during operation or immediately after operation. 8． Keep away from small children and/or pets. 9． In case of damage or malfunction, suspend usage immediately, unplug the power source, and refer all servicing to qualified personnel. Please contact Little Dot for assistance.

  • Page 3: Basic Troubleshooting

    Ground Loops: In systems where the components have multiple paths to ground, you may notice a 60 Hz hum on the Little Dot output. Please only use a cheater plug power-cord as the last resort, as this can be a safety hazard. To resolve ground loop issues, the better method would be to use a ground loop isolator.
  • Page 4 Vacuum Tube Troubleshooting  Noisy Tubes: Since the tubes used in Little Dot amplifiers can be very old, there is a distinct possibility the pins have oxidized and therefore can cause hissing, crackling, buzzing, and various other noises during operation. This is common with vacuum tubes and is nothing to worry about, as there is an easy remedy.
  • Page 5 We suggest for every 6-8 hours of burn-in, you allow your Little Dot to cool-down for 30 minutes to an hour. Please also refrain from burning-in your Little Dot in an area with little to no airflow, and can easily build up heat.
  • Page 6 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...
  • Page 7 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 ...
  • Page 8 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).
  • Page 9 For best sound quality and lowest noise, first maximize your source’s output level without introducing gain (i.e. to 0 dB), and then set your Little Dot MK III’s volume to a relatively high level. Amplification done at the pre-amp stage will result in less noise than amplification done at the power amplifier stage (if the amplifier you are using as a power amp has volume control at all).
  • Page 10 Little Dot MK III Jumpers for Driver Tube-Rolling The Little Dot MK III has three jumper pins (JI) that allow two different types of driver tubes (earlier circuit versions may have switches or 2 pins). You can access the jumper pins through the amplifier’s bottom panel, and they are located to the sides of the pair of capacitors closest to the front of the amplifier.
  • Page 11 The Little Dot MK II uses 6H6pi (6H6n) power tubes by default, and these can be replaced with 6N6, 6N6P, 6N6P-I, and 6H6n-N power tubes. If your Little Dot MK III is circuit revision 2.0 or higher, you may also use...
  • Page 12 Little Dot MK III Warranty Information 30 day money back guarantee. If you are not completely satisfied with your Little Dot amplifier, you can return it to us for a full refund of your purchase price. Please note the following stipulations for returns: ...

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