THIS IS MY PRIVATE SALE- I guarantee the headphone amp personally. call me directly 516-902-2446 with questions. Shipping will be split at $45 each ($95 to ship in USA) which is not included but needs to be mentioned as its 48lbs to ship and I can not do free shipping
 
Cayin HA-6A Open Box
comes with stock tubes. 
Add $110 for a set of KT88 by Mullard OR KT88 JJ Tubes or Gold Lion KT88. You can choose. They cost $200-$300 new and are barely used. Not even 50 hrs on the tubes.
Add $300 and get all 3 sets of KT88 tubes! 
 
DUAL OPERATION MODE: TRIODE AND ULTRALINEAR
Change your sound signature with the flip of a switch, optimizing the presentation for different moods or styles of music. Triode mode offers a smooth sound with rich harmonics and lush, holographic imaging. Ultralinear Mode improves the dynamics and punch, with a clean authorative sound and enhanced extensive on both ends of the frequency spectrum.
JUST ROLL WITH IT
HA-6A is built for tube rolling. The included EHX EL34 were hand selected by Cayin's engineers, but you can easily change the sound with different types of tubes to fully explore your tonal options. Combine easy tube rolling with selectable impedance for headphones ranging from 8-600 ohms, and the tonal options are endless.
KEY FEATURES
Impedance Matched Headphone Output: choose from Low, Medium, or High impedance to match your headphones
Optimized Headphone Outputs: the 4-pin XLR will provide the maximum power while the 4.4mm output allows for compatibility with high-end IEMs and more sensitive options.
60 second start up delay circuit: Protects your tubes and minimizes noise related to the warm up cycle of the amplifier
 
INCREDIBLE CRAFTSMANSHIP AND IN-HOUSE DESIGN
The entire circuit is hand wired using point to point wiring, rather than a circuit board. Point to point, shortens the signal path and improves the efficiency and conductivity. Cayin also uses power transformers designed and wound in house, to ensure that the shielding and output is up to their standards. HA-6A's power transformers are a matched pair for further power and efficiency in the design.
SPECIFICATIONS
Tubes:
Power: EHX EL34 EH
Drive: JJ 12AU7 EH
Rectifier: RCA 17AX4GT
Analog Inputs
RCAx2
XLRx2
Output Power
Single Ended/Triode: 750mW (L), 1400mW (M), 2200mW (H)
Single Ended/Ultra-Linear: 1000mW (L), 2000mW (M), 3300mW (H)
Balanced/Triode: 1000mW (L), 1800mW (M), 2900mW (H)
Balanced/Ultra-Linear: 1600mW (L), 2800mW (M), 4200mW (H)
THD: <1%
SNR: 98dB
Weight: 19.5kg
Dimensions: 360mm x 322mm x 197mm
Power Consumption: 140W
IN THE BOX
HA-6A Amplifier
Tubes
Power Cable
User Manual