Pure Class A Headphone Amplifier & Pre Amplifier
Hybrid ! Valve & MOS-FET in Use!!
Without any OP amp IC inside!!!
Audiophile Performance Design Absolutely!!!

Our  headphone amplifier is different to others.
A/ High grade Caps & DJapan KOA resisters, ALPS volume in use.
B/ High cost Large 24V2A low noise adapter with grounding.
C/ Precision select 6N11 valve, also match R/L channel within 1dB out put differential.

It is a high value and cute headphone amplifier hook up to your PC / Mp3 /MP4/ ipod / any stereo device. You can have a powerful, dynamic and sweet TUBE SOUND from your headphone ! You’ll be astounded at the improvement in sound quality, dynamic range, meticulous transparency, completely demonstrate its high performance and analytical ability, it can also connect with power amplifier such as a high performance pre amplifier to improve your Hi Fi system.

New 6N11 tube 1970-1983 made in Peking mark with <J>, but never used.
In China <J> means for military use (highest grade)
(we have carefully choose and test in Lab).
-Using Elna Caps and Dale resistor.
The each one of 6DJ8/6922/ECC88 is fully suitable for replacement with much difference musical taste chose by owner. (6DJ8/6922/ECC88 Excluding in this item for sale)!

FAQ
Q: what is Class A ?
A: Class A means that the power tube conducts the same amount of current all the time, whether idling or producing full power. Therefore, it will be high temperature from power MOS FET in normally. Class A is very inefficient with electricity but usually gives very low distortion. This is to decrease the distortion such as a high-end amplifier.
Q: Can I change the 6DJ8/6922/6N11/12AU7/...... tube to improve the sound quality?
A: The each one of 6DJ8/6922/ECC82 is fully suitable for replacement with much difference musical taste chose by owner, but it is not 100% improve the sound quality absolutely; some time it can change to the favorite sound by carefully chose; a precession selects and checking is most important. Never superstition to the high price tubes!!

Q: I find a similar product with 3 bands EQ, does it better than your MK2?

A: By our sense, any tone control will be colorless the sound and distortion, so you cannot find any high-end device with a tone control; it also build in mid/low grade Hi Fi device except Marantz 7 / Cello Audio Palette.

Technical specification:

In Put Power: DC24V 900mA

Input Sensitivity:50mV

Input Impedance: 100KOhm

Out-Put Impedance:12~600 Ohm

Dynamic range: 84.6dBA((300 ohm) 89.8dBA(33 ohm)

Gain:20dB

Frequency response:10Hz-60KHz +/- 0.25dB

Minimum THD: 0.016%(300 ohm) 0.45%(13 ohm)

Signal/Noise Ratio >92dB

RCA 2CH Input X1 / RCA 2CH output X1

6.3mm 2CH Output X1

Shipping Weight: 1kg

Transformers AC100V ~AC240V\50~60Hz 1.8A DC output 24V2A

It has a ferric filter ring on DC power cord to reduce noise; much high performance than other similar product.

Dimension:100mm (D) X 100mm (W) X 50mm (H) not measure to tube and transformer.

What is different coming?
MK2, it has grown up from old version  Valve Class A Hybrid Headphone/Pre-Amplifier, we does not satisfy to let it improve only!
We have modified to generation II now, so that we call it MK2.
1/ Output signal also15 seconds delay when power on, it is important to reduce the ‘pop’ pulse, safe to your ear and speakers.
2/The thick of PCB increase to 2mm with carefully design grounding, the RF pollution and noise ratio also improved.
3/ There are ALPS signal selector, long life 10000times power switch, heavy duty I/O parts & switches to use.
4/ It is good news to ‘tube roll’ people, easy to change the tubes with switch (bias adjust is necessary), 6 series for 6DJ8/6922/ECC88/6N11/6N23P; 12 series for 12AX7/12AU7/12AT7/6N4……also too many choose by owner right now.
5/Ultra large current Class A output design, it can drive the low impendence headphone in 12 Ohm loading; a very deep and powerful bass you will be hear !
6/ Audiophile Performance Design Absolutely! It can direct hook up to power amplifier such as Pre Amp to use; it will kill any pre amp with US$1000- price (may be higher)!!
"Dale" resistors is very high cost than other similar product, it working most stable in long life and also sounds…
• Precise pin pointing focus.
• Equal resistance (L/R) all the way.
• Deeper depth and sweeter vocal.
• Cleaner bass and sweeter treble.
• Sound image is much improved. Pin point image!!!
If you would like to take total care of your amp, resistors are the first one to be focused. Resistors are used more of any other components in an amp circuit, therefore each small impact can make a big difference in total.