Meet the xDuoo TA-66, a high-performance tube amp designed in the spirit of classical tube amplification. Employing retro engineering techniques like point-to-point wiring, the TA-66 provides a truly classic tube sound. But thanks to modern components and amenities like a step volume potentiometer and an aluminum alloy shell, it doesn’t feel trapped in the past. The result is an amplifier that delivers golden age velvety sonics with a contemporary sensibility.
Precise point-to-point wiring
Printed circuit boards, while convenient, can invite signal interference and complicate repairs and modifications. The TA-66 overcomes these problems with point-to-point wiring, a traditional engineering technique that ensures the shortest possible signal paths and minimal interference. By connecting each component directly with copper wires, the TA-66 significantly improves the amp’s reliability and ease of repair and modifications.
Step-by-step volume control: Perfect balance at low volumes
Say goodbye to left-right imbalance at low volumes. The TA-66’s step-by-step volume potentiometer ensures precise control, maintaining perfect stereo balance from whisper-quiet to room-filling sound.
Aux out preamp
With its aux out preamp feature, the TA-66 can serve as the heart of your audio setup, enhancing the sound quality of any amplifier or active speaker it's connected to.
Aluminum alloy shell: Solid and interference-resistant
The TA-66's solid aluminum alloy case and sandblasted texture panel aren't just about looks—they shield your music from external interference, ensuring nothing gets between you and your favorite tracks.
Product highlights
6N2 tube for the pre-amp stage
6N5P tube for the buffer stage
OTL amplifier
Point-to-point wiring for minimal interference and pure sound
Step-by-step volume potentiometer for precise volume control
Aux out preamp for enhanced sound quality in your audio system
Professional-grade resistances and capacitors for uncolored sound
Solid aluminum alloy shell and sandblasted texture panel for durability and interference resistance
Specs
Power source: AC 110V (100-120V) / 220V (220-240V)
Output power: 200mW (300Ω load)
Headphone jack: 6.35mm
Frequency range: 10Hz - 30kHz (±1dB)
Gain: +18dB
THD+N: 0.08% (1kHz @300Ω load)
SNR: 107dB
Suitable earphone impedance: 60Ω - 600Ω
Size: 11.4 x 6 x 7.2 inches (29 x 15.3 x 18.4cm)
Weight: 11lbs (5kg)
What’s included
xDuoo TA-66 Tube Amplifier
Power cord
User manual
Featured reviews
"An excellent entry point to vacuum tube headphone amps." -WaveTheory
"I really like the TA-66. It sounds rich and clear....I like the form factor and knob feel....It transcends fun-fi and is a legitimate piece of audio gear." -United States of Analog
“Definitely has a tube sound signature with bass emphasis, smooth mid presentation, and treble that isn’t nearly as sharp as a solid state amp. It’s a warmer presentation. Perfectly-priced. xDuoo hit this out of the park.” -No Theme Reviews
"This is a classic OTL headphone amp that sounds great and imparts the warmth and lushness to recordings that makes it easy and pleasurable to listen for long sessions. I love it most for jazz, vocals, classical, pop, classic rock. I have another headphone amp that’s solid-state and comparing the two, the OTL has a softer, rounder, warmer presentation than the solid-state amp. Compared to other OTL amps this one is a steal. Great solid quality build, good looks, fantastic performance, and a price that makes it hard to refuse. I couldn’t be more pleased with it."
— Greg G. (5/5)
"great"
— Miles (5/5)
Nice Headphone Amp
"Great sound with headphones but not great as a preamp."
— Mike S. (4/5)
"For the price i am impressed, after about 5 hours it did start to open up and have more texture to guitars and vocals. If you buy this give the tube time to heat up wear in, and make sure your power cable is grounded properly or at least not with other devices on a splitter, it will have noise. I wish tubes for lower budget amps were more readily available, HINT HINT RAY TUBES 😉"
— Shaye (5/5)
Just buy it
"Sounds great and worth the price for sure. Front tube is a pain to replace but it’s a small problem for a great amp."
— Forrest R. (5/5)
"Worth every penny and ZMF VO and VC sound pretty amazing on this amp. This amp in weight is lighter then Woo Audio of similar foot print. Looks and manufacturing of casing high end quality. The difference is the absence of output transformer and ZMF is perfectly controlled. I’d like to add I’ve been rolling in many other variants in the 6as7 spec group. Tung sol 7236 metal with Gold lion 6922 is just dreamy on HD6xx and greater on my VO and VC."
— William (5/5)
Amazing!
"Build quality is really fine! Sound too, even with stock tubes. Had some issues with hiss on the right channel. After changing the tubes to russian NOS anything disturbing vanished an there's nothing else than enjoyable music. Yes, gain could be a little bit more, but it's driving my DT880@600 to high volume anyway. Never heard those cans better in the decades before!"
— Reiner S. (5/5)
Heavy build, rich sound
"The TA-66 sounds excellent! The build quality is very robust and the tone is rich with outstanding bass response. It takes the squeaky clean tone of my solid state preamp to another level of realism and enjoyment."
— Zachary H. (5/5)
Got Planars?
"I was hopeful that this amp would properly drive my 60ohm planar magnetic headphones, and I was fully prepared to be disappointed and return the amp. But. . . they sound great! For my first tube amp, I think this is an incredible deal. I have "rolled" 2 NOS tubes and the sound only improved."
— Tom S. (5/5)
Great amplifier!
"My experience with Apos could not have been better. The amp arrived earlier than promised, and in as advertised condition. Apos is a great place buy audio great."
