xDuoo MT-604 Balanced Tube

General Information


xDuoo MT-604 Balanced Tube

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Tube + Transistor Hybrid Headphone Amplifier Pre-Amplifier​

  • Tube + Transistor Hybrid Amplifier​
  • Compact Portable Headphone Amplifier​
  • Professional Capacitance​
  • XLR and 4.4mm Balanced Input/Output& Independent Volume Adjustment​
  • Built-in Mute Circuit&Sand-Blast Textured Surface​




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Fully balanced tube amp
xDuoo doesn’t do incremental improvements. They evolve by leaps and bounds. The MT-604 is a Class-A tube amp that doubles its predecessor’s tube count and channels, making for a fully balanced tube amp experience.

Tube + transistor
Jump back in time with the supple sounds of tube amplification. Known for its soft, sweet mids and laid-back highs, the 6J1 tubes of the MT-604 will thaw the coldest of expectations with their warm reproduction of vocalists and stringed instruments.

A common complaint about tube amplifiers is their lack of high frequency response and resolving power. To overcome this, xDuoo added a rear transistor circuit capable of large dynamics, high speed, and resolving power. Tubes + transistor: the best of both worlds.

Class-A amplifier
The MT-604 is a class-A amplifier. Using simple circuits that draw the same amount of current and consume the same amount of energy whether receiving a signal or not, this is the most straightforward of amplifier types. It isn’t subject to electromagnetic interference caused by digital components, so its total harmonic distortion and signal-to-noise ratio are exceptionally low.

53% more power than the MT-602
The MT-604 outputs up to 2000mW (32Ω) of power. That’s 53% more power than the MT-602--enough to drive even the HiFiMAN HE-4.

XLR and 4.4 balanced input/output
The MT-604 is a fully balanced amplifier. Plug in any source into its XLR or 4.4mm balanced inputs, and enjoy rich, unhampered sound from its XLR or 4.4mm balanced outs.

Independent left/right volume adjustment
Sound bias--the phenomenon of one driver being louder than the other--is a thing of the past with the MT-604. Independent left and right volume adjustments let you control each channel separately, ensuring perfectly equal volume across both headphone earcups.

Built-in mute circuit
Anyone who’s ever plugged in their headphones before turning on their amplifier knows that many amplifiers make an ear-splitting “pop!” noise when turned on. Thanks to a built-in mute circuit, the MT-604 prevents this from happening, saving your ears and your patience.

Interference-blocking chassis with sand-blasted texture
The aluminum alloy chassis is a rugged defense against bumps, bruises, and electronic interference. The sand-blasted gray shell beautifully complements the striking red dials and atomic-era aesthetic of the tubes.

Tubes will roll
Adventurous audiophiles will love swapping out the stock tubes for other tubes. Every model of tube has a different sound signature, enhancing or reducing warmth, detail, and soundstage. It’s a fun way to play with the sound signature of a single amp, often for less than $30 a pop. Just be sure to find a reputable dealer of tubes before buying.

Product highlights
Tubes + transistor hybrid
Fully balanced amp
Four 6J1 tubes
Class-A amplifier
53% more power than MT-602
XLR and 4.4mm balanced outputs
Independent left/right volume adjustment
Built-in mute circuit
Interference-blocking chassis
Switchable tubes

Specs
Power supply: DC12V/2A
Output power: 2000mW @32Ω 1kHz
Inputs: XLR
Outputs: XLR, 4.4mm balanced
Dynamic range: 85dBA @32Ω
Frequency response: 10Hz - 60,000Hz (±0.5dB)
Suitable headphone impedance: 16Ω - 600Ω
Gain: +15dB
Size: 6.6” x 3.9” x 2.3” (17 x 10 x 6cm)
Weight: 1.2lbs (0.55kg)
S/N: 115dB
THD+N: ≤0.01% (@32Ω, 1kHz)

Available From USA Distributor APOS at $169

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Comments

hmscott

500+ Head-Fier
I've already built up a nice-sounding cache of 12AU7, 12AT7, 12AX7 series compatible tubes for the Xduoo TA-20 - also good in the TA-30 + rectifier, but this is an awesome setup at a low entry-level of $169!! And, the MT-604 puts out 2W! IDK if it will drive the Hifiman HE6SE V2 - Xduoo mentions powering the Hifiman HE-4:

"53% more power than the MT-602
The MT-604 outputs up to 2000mW (32Ω) of power. That’s 53% more power than the MT-602--enough to drive even the HiFiMAN HE-4."
 

mikemuzak

New Head-Fier
So maybe a Schiit Modius DAC, then, to connect to that.
Sure, or the Topping D30 Pro - $399
S.M.S.L M200 - $249 - $299
iFi Zen Dac - $130, or the V2 that just released - $160, this setup would require 4.4mm to dual XLR, $20
Soncoz LA-QXD1 $199
Soncoz SGD1 - $459
Khadas Tone2 Pro - $199, this would require a special cable because they developed a proprietary connection somewhat out of necessity due to how impossibly thin the unit is. It's the Khadas Balance-RCA to XLR Adapter & Cable $49 for the 8in length or $79 for 3ft. (for me, 3 ft. of interconnect would piss me off all the time for how much it would get in the way.)
 

Silgalias

New Head-Fier
Sure, or the Topping D30 Pro - $399
S.M.S.L M200 - $249 - $299
iFi Zen Dac - $130, or the V2 that just released - $160, this setup would require 4.4mm to dual XLR, $20
Soncoz LA-QXD1 $199
Soncoz SGD1 - $459
Khadas Tone2 Pro - $199, this would require a special cable because they developed a proprietary connection somewhat out of necessity due to how impossibly thin the unit is. It's the Khadas Balance-RCA to XLR Adapter & Cable $49 for the 8in length or $79 for 3ft. (for me, 3 ft. of interconnect would piss me off all the time for how much it would get in the way.)
Could I use my Scarlett Solo as a DAC for that?
 

hmscott

500+ Head-Fier
Could I use my Scarlett Solo as a DAC for that?
The Focusright Scarlett Solo monitor outputs on the back are balanced 1/4" TRS Tip Ring Sleeve outputs - so you would need 2 cables to go from those 1/4" balanced to 3-pin XLR balanced connectors.

I haven't used the Scarlett Solo, I'm reading specs, and came across a number of posts looking to upgrade the audio output level to drive headphones better, so the MT-604 could be a good solution, especially if you like tube sound with SS ease of interface output. :)
 

bithloman

100+ Head-Fier
The TA-20 has an AUX out with 3 inputs, and on sale it's been $369... Only 2 tubes to roll - 12AU7/12AT7/12AX7 :)
xduoo-ta-20-stereo-audio-headphone-tube-amplifier-amp-balanced-classical-12au7-tube-amplifier-hifigo-black-863677_1000x1000.jpg


Image linked from: https://hifigo.com/products/xduoo-ta-20-balanced-classical-12au7-tube-stereo-audio-headphone-amp
yes but aux out means no tube sound coming out the back right? its just rca passthrough not pre amp. does anyone know if the 604 can be used as a pre amp? cheap audio man on youtube says he uses it as a tube pre amp to add tube sound through the 4.4 output. is that possible? maybe if the volume is low enough the voltage will be low enough to avoid distortion or damage of the other device.
 

hmscott

500+ Head-Fier
yes but aux out means no tube sound coming out the back right? its just rca passthrough not pre amp. does anyone know if the 604 can be used as a pre amp? cheap audio man on youtube says he uses it as a tube pre amp to add tube sound through the 4.4 output. is that possible? maybe if the volume is low enough the voltage will be low enough to avoid distortion or damage of the other device.
Although I haven't actually tried the TA-20 Aux Out, I can't imagine it would bypass the Pre-Amplifier stage (tubes) and jump through only the SS section - or passthrough without any amplification of any kind.

I suppose I could try taking the RCA AUX Out of the TA-20 and feed it into my Topping A90 to see what's what, but it may take me a while to get time to get around to it... I'll update later.

Why would you think AUX Out is a passthrough from AUX In, which would therefore make it not useful? :)

The AUX Out is single-ended RCA out. Perhaps that is why someone tried to used a 4-pin to 4.4mm output - to get a Balanced output?

The TA-20 doesn't have a 4.4mm balanced headphone output. The TA-20 has a 4-Pin balanced headphone output. I use a SendyAudio 4-pin to 4.4mm pigtail adapter, originally bought from MusicTeck. The TA-20 also has a 6.35mm single-ended headphone output.

You could try asking questions about the TA-20 to/through support@hifigo.com, ask nicely for their help - you might mention if you plan to order through them if the answers are satisfactory, or ask through the support email of the vendor you plan to eventually order through instead.

Hifigo passed more technical questions through to Xduoo directly - and that is how I found out the TA-20 will directly support the 12AT7 and 12AX7 along with the stock 12AU7 - all without any user involved adjustments. I also found out the TA-20 will take the full balanced output of my Topping D90 MQA - it overdrives some headphone amps - and the TA-20 can take 8vpp input before being overdriven.

I would be surprised if the TA-20 AUX Out wasn't useful; I'm assuming the TA-20 AUX Out to be Variable volume controlled through the Volume knob using the Tube Pre-amplifier and SS stages to provide a useful function of "Pre-Amplifier" :)
 

CADCAM

Headphoneus Supremus
Since I have a Little Dot MKIII I already have matched pairs of Russian 6J1, Yugoslavian 6HM5, 67' Sylvania 5654 & GE 5654 plus 2 pairs of the Tung-Sol 6AK5W! Let the rolling begin...well I'll need the amp first supposed to be here in a month!
Slow @$$ boat from China.
 

fjlabs

Head-Fier
Just grabbed one of these in the latest Linsoul sale. Hope to review it when it gets here.

The multi-volume-knob is interesting... Not sure how well that would work...
 

CADCAM

Headphoneus Supremus
Just grabbed one of these in the latest Linsoul sale. Hope to review it when it gets here.

The multi-volume-knob is interesting... Not sure how well that would work...
You know, I posted this in error as I ended up going with the 602. I was contemplating the 604 but ultimately went with the 2 tube option. I'd still be interested in your thoughts when you get the unit.
 
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