Little Dot I+ Hybrid Headphone Amplifier

Current production Little Dot models and pricing

Moderators: DavidZheZhe, sword_yang

Little Dot I+ Hybrid Headphone Amplifier

Postby DavidZheZhe » Jan 10th, '10, 10:01

Little Dot I+

105 USD plus shipping

  • North America (USA, Canada), Oceania (Australia, New Zealand), and East Asia shipping: 34 USD
  • Western Europe shipping: 39 USD
  • Eastern Europe, Central Asia, and Middle East shipping: 54 USD

You can purchase the Little Dot I+ directly via PayPal. The price is all-inclusive (shipping, standard tube set, Type-B power cord, and set of RCA cables). If you would like to add extra tubes or other custom order options, please email us at

Buy Little Dot I+

Tube Upgrades:
  • Upgrade to EF92: 20 USD
  • Upgrade to WE408A: 52 USD


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 specifically designed and optimized for driving low impedance headphones that require high current to perform to their full potential. Depending on how the switches are configured, three different families of vacuum tubes can be used (EF95, EF92, and 408A). 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!

Little Dot I+ Review at Truly Gadgets: ... -tube-amp/

Technical Specifications:

  • Input: Gold-Plated Unbalanced Phono (RCA) Jacks
  • Output: 1/4" Gold-Plated Stereo Headphone out
  • Tube Options:
  • 6JI - standard
  • Replace standard tubes with EF92 - additional $20 USD
  • Replace standard tubes with WE408A - additional $50 USD
  • Frequency Response: 10HZ - 50KHz (-3 dB)
  • THD+N:
  • 0.2%: 1Vrms @ 1000Hz
  • 0.6%: 3Vrms @ 1000Hz
  • 1.0%: 5Vrms @ 1000Hz
  • Signal-to-Noise: 92dB
  • Suitable Headphone Impedance: 8 - 600 ohms
  • Input Impedance: 50K ohms
  • Power Output:
  • 150mW @ 300 ohms
  • 300mW @ 120 ohms
  • 800mW @ 32 ohms
  • User variable gain settings: 6.5x or 3.25x
  • Power Consumption: 15VA
  • Measurements:
  • Metric: 180mm (L) by 97mm (W) by 100mm (H)
  • English: 7.08 inches (L) by 3.81 inches (W) by 3.93 inches (H)
  • Weight: 1.5 kg or 3.3 lbs.
  • Available in Black
  • Available in either 120VAC or 220VAC
  • 1 Year Little Dot Warranty
  • In addition to direct purchase (Email us), also available on EBAY for our customer's convenience. Please search for Little Dot Amplifier sold under EBAY seller Davidzhezhe

Power Cord Note: Little Dot amplifiers ships with a standard Type-B power cord (American 3-pin or U-ground) suitable for use in areas such as North America, Japan, Taiwan, etc. If your country's outlets use other power cord types (ex. Schuko) you will need to provide you own power cord. You likely have several spares around your home, as any standard power cord (like your computer's power cord) will work perfectly fine. We do apologize for any inconvenience!

Posts: 1661
Joined: Mar 14th, '06, 01:25

Little Dot I+ Reference Guides

Postby DavidZheZhe » Jan 12th, '10, 08:49

Posts: 1661
Joined: Mar 14th, '06, 01:25

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