One Pair E405 300W 4-8Ω A1943/C5200 2SA1930/2SC5171 AMP Power Amplifier Board


Feature:
1. Original Toshiba A1943/C5200 and 2SA1930/2SC5171.

2. The interstage coupling capacitor adopts WIMA top capacitor 1UF, and the main circuit of electrolytic capacitor signal adopts imported Panasonic brand name to ensure strong and continuous power support.

3. The biggest feature of this board is the use of the current advanced C1237 BTL speaker protection circuit, which effectively eliminates the impact sound and DC output protection function of the opening and closing, making your speaker safer.

4. The layout of the entire circuit board is quite rigorous and reasonable. The overall PCB trace is grounded at one point. The power amplifier board works stably and reliably, and the output power is large; the sound is beautiful and round, and the sound field is wide. The three-dimensional sense is strong, the low frequency is solid and solid, the signal-to-noise ratio is quite excellent, the dynamic range is wide, the details are clear, the transient response is excellent, and all kinds of music are played comfortably. It has a very good performance in the family's playback environment.

Parameters:
1. Power supply: DC+-(35V-55V) recommended +-45V and AC12V
2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 4 ohms
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 at 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. Left and right symmetrical output input

Package:
One Pair E405 300W 4-8Ω A1943/C5200 2SA1930/2SC5171 AMP Power Amplifier Board

Payment Method: PayPal preferred

Shippment:
1.We provide free shipping to international via China Post Airmail, and every parcel will be registered with tracking number. We can also ship by UPS/EMS/DHL/FedEx 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.
3.Time of Delivery:Based on the China Post Airmail and our experience, kindly please be noted that To United States / United Kingdom / Australia, it takes around 10-15 business days; To Canada, it takes around 12-18 business days; To Brazil / South America, it takes around 25-35 business days. To Italy / France / Spain / Germany/ Eastern Europe, it takes aournd 15-20 business days.

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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