Parameters：
1. Power supply: DC±(35V-55V) recommended ±45V and AC12V
2. Power: 300W (total harmonic distortion THD+N<0.1%), DC±45V, 4ohms
3. Class A 90W （measured under 4 ohm load）
4. Speaker impedance: 4-8 ohms.
5. PCB size: 59*236MM.
6. Adjust the differential input stage current to 2MA: Adjust the VR1 (500R) adjustable resistor so that the voltage between C and D is 1.5-2V (that is, the voltage across the R9 (1K) resistor); the input differential current is 1.5- 2MA, this value is the best sound quality
7. The quiescent current of the large tube is 100MA: Adjust the adjustable resistance VR2 (1K) so that the voltage of the two points A and B is 22MV. At this time, the quiescent 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. A pair of boards with left and right symmetrical output inputs
Features：
1.Use original Toshiba A1943/C5200 and 2SA1930/2SC5171.
2.Use the C1237 BTL speaker protection circuit, effectively eliminating the impact sound and DC output protection function of the open and shutdown, making your speaker more secure.
3.Stable work, beautiful sound, strong stereoscopic effect, steady bass, excellent signal to noise ratio.
Package:
1pair E405 Amplifier Board
Payment Method: PayPal preferred
Shippment:
1. Shipping to international by China Post Airmail, every parcel will be registered with tracking number. We can also ship by FedEx/TNT/EMS for alternative shipping method for corresponding fees. Please let us know before payment if you need split shipment.
2.International shipping requires complicated shipping procedures (such as both countries customs, transit stations etc.), also will be affected by many factors, such as holidays, weather conditions etc, If you have not received your shipment within 30 days from payment, please contact us.
Returns & Replacements & Repair:
We accept returns & replacements within 30 days from the day the customer receive the products, please make first contact within 30 days from receiving the order. Products should be returned in original condition. As a benefit to our customers, we also provide repair within 3 months from the day when this item is shipped out, after repair is done, we will send you the item, but the customer should pay both shipping ways.
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