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.



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

Shipping: 

In your checkout details, please provide the voltage you require (110-120V or 220-240V), as well as a telephone number for shipping purposes.  Please allow 3-6 business days prior to shipment for testing and a final QC check of your Little Dot. Shipping will either be via DHL or global EMS (i.e. your national postal courier), and generally takes 4-10 business days to anywhere in the world.   Tracking will be provided shortly after shipment.  Please note that any custom taxes/fees your country may levy are not included (although we do ship with value declared low and/or as a gift). 


Warranty and Support:

All Little Dot amplifiers carry a 1 year Little Dot warranty.  Please note that the SquareTrade warranty offered at the top of this listing is from a 3rd party, and something automatically added to the listing (we cannot remove).  You do not require the SquareTrade warranty as we offer among the best warranty and support in the business.  Please do note that Little Dots sold through unauthorized or gray market sellers will not come with our support or warranty as we cannot guarantee the units are authentic and/or new.  For more information on our warranty policies, please see our website/forum at Little Dot Warranty and Support


More information and discussion can be found on our website/forum at www.littledot.net.  We hope to see you there!