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Audio-GD HE-2 MK3 - Balanced ACSS non negative feedback Power Amp with Regenerative Power Supply

What's new:
HE2 MK3 had built in the new design gain board and the latest design regenerate power supply board , improves on sound quality obvious.

Regenerate power supply with separate 4 blocks
30W pure class A , 250W class A at 8 ohm each channel
Supports XLR and ACSS inputs
Apply Real balanced ACSS non negative feedback power amp
Apply "Linear Fidelity" technology non negative feedback output stages
Soft start power design
80 pcs ON semiconductor (Motorola) output transistors　

Compare to Master 2H:
We tried two pair Master 2Hs working in Bi-Amps mode, compare to one pair HE-2MK2 working in the normal mode, in our opinion that the HE-2MK2 still better sound quality overall than the two Master 2Hs.

SUMMARY
True split mono power amplifier with built-in regenerative power supply
There is no negative feedback at all. The CAST circuit gain stage works in a pure Class A state. The signal channel does not use OPA and coupling capacitors.
The completely feedback-free output stage using linear fidelity technology avoids switching distortion and has excellent linearity, making the performance as good as a pure Class A amplifier without the high heat of a pure Class A amplifier.
2 sets of inputs: XLR / ACSS, even if XLR input, the signal will be amplified by CAST amplifier
Using 80 high-power transistors from ON Semiconductor of 15A/230W each. With 30W pure Class A per channel, and 250W Class A (8 Ohms) output
Using six transformers with a total power of more than 2000W for power supply, 260,000 UF filter capacitors provide separate power supply for the left and right channels
Eight-channel pure class A parallel regulated power supply
The two gain modes of 20 and 26DB can be switched at the rear of the machine to easily match ultra-high or ultra-low sensitivity speakers.

SPECIFICATIONS
S/N Ratio: >120DB
THD+Noise:
XLR input, THD+N at 8 ohm 10W: approximately 0.03%
XLR input, THD+N at 8 ohm 50W: approximately 0.04%
XLR input, THD+N at 8 ohm 100W:: approximately 0.05%
Gain: +20/+26 DB
Output: >250W @ 8ohm, >500W @ 4ohm, >1000W @ 2ohm
Input sensitivity: 2.2V RMS @ XLR, 2mA RMS @ ACSS
Input impedance: 94K ohm @ XLR, <10 ohm @ ACSS
Frequency Breadth: XLR input, 8 ohm 1W output : 20-100KHz (-3DB)
Channels cross: Mono design without channels cross
Channels imbalance: < 0.01DB

Power Requirements:
1 Version 100-120V AC 50/60 Hz
2 Version 220-240V AC 50/60 Hz

Power Consumption: 300W static @230V (whole units)
Transformer Power: >2000W (6 transformers)
Package Weight: Approximately 85KG

Dimensions:
Amps : 360mm (W) x 270mm (H) x 457mm (D) (each unit) (MM, Fully Aluminium ) 

Accessories:
Power cord X2