Little Dot I+ Hybrid Tube Transistor Headphone Amplifier


* The Little Dot I+ is a hybrid vacuum tube - transistor headphone amplifiers designed to deliver the high current output low impedance headphones require to sound their most dynamic and impactful!
* Available in either 120VAC or 220VAC
* $104 plus $34 shipping to USA, Canada, Australia, and most of Asia
* $104 plus $39 shipping to most of Western Europe (minus the Netherlands)
* Please inquire for other destinations.
* EF92 Tube Upgrade: +$20
* WE408A Tube upgrade: +$50
* 1 Year Warranty

The new 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
WE408A

Little Dot I+ 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

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!

Purchasing Instructions:

At the time of purchase, please indicate the following information in your EBAY checkout notes section, PayPal payment notes section, or in a separate email/EBAY message:

  • A contact telephone number for shipping purposes. Global EMS requires the recipient’s telephone number for international deliveries.
  • The voltage specs of the country in which you reside (generally 120VAC or 220VAC)
  • Note: Please note that the photos shown are with the WE408A tubes. The default tubes for the Little Dot I+ are the 6JI tubes. Photos are for illustrative purposes only. Please refer to the product description for the most explicit and up-to-date specifications, components, parts, tubes, accessories, etc.

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