stereo hiend E405 power AMP amplifier board ,class A 2*60W,class AB 2*200W

Description

Product Description:
this amp reference on
Accuphase
E405
All parts of this product are original authentic, unpretentious, ; use high quality original parts,
,E405 is an upgraded version of the E305. It belongs to the FET double differential input  .
The diamond   structure has a very low distortion. Unlike the E305, the E405 is pure DC, no coupling capacitor, no feedback capacitor,   it has excellent dynamic response and  deeply bass
DC servo circuit (operated by OP07 with extremely low noise), Omron Relay
+C1237  speaker protection to protect your speaker
E405 sound features: natural slender, wide sound, great dynamic effects, the biggest feature is the deep bass  .
product details:
n Original ON MJ15024G/MJ15025G and Toshiba 2SA1930/2SC5171.
Basic parameters:
1. Power supply  :  range DC +-35~55V ,,,(recommended +-45V (AC: transformer 300VA   AC32V-0-32V)
Another group: single AC12V (Note: each board use single AC12V power supply is independent, that is, one board is used
Single AC12V  )
2. Power: class AB 200 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 4 ohms
3. Class A 60W, measured under 4 ohm
4. Speaker impedance: 4-8 ohms.
5. PCB size: 105*236MM.
Board: 110 wide (including angle aluminum) * 236MM
6. install taps:
Adjust  input stage current to 2MA: slowly Adjust the VR1 (500R) adjustable resistor to the voltage at C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); so.that current is 1.5- 2MA, this value is the best sound quality
7.   adjust current of the output  transistor to 100MA: Adjust the adjustable resistance VR2 (1K) ,then, that the voltage of the two points A and B is 22MV. At this time, the  current I=22MV/0.22R resistance is 100MA; if the customer heat sink is large enough, it can make Increase the quiescent current, generally 100MA-300MA sound effect is best.
8. Weight: 0.5KG+0.5KG