1pair Class A E505 Amplifier Board High Power HIFI Gold Seal Tube MJ15024G /25G

Description

1pair E505 Class A High Power HIFI Amplifier Board
This pure post-stage power amplifier board belongs to the diamond-diamond structure of FET double differential input with low crossover distortion; current negative feedback type, with dynamic response and dive depth; with DC servo circuit (by noise Very low OP07), Omron relay + C1237 speaker protection to protect your speakers; increase the output overload and overcurrent protection.
Description:
1. Power supply parameters: one set: DC+-(35V-55V) recommended +-45V (AC: transformer 300W double 32V, need to add rectifier board)
Another group: single AC12V (note: each board is powered independently by a single AC12V power supply, that is, one board is powered by a single AC12V power supply)
2. Power: 300 watts (total harmonic distortion THD+N<0.1%), DC+-45V, 3 ohms
3. Class 80W, measured under 3 Euro load
4. Speaker impedance: 4-8 Euro.
5. PCB size: 87x334mm; with aluminum: 110x334mm
6. First adjust the differential input stage current to 2MA: adjust the VR1 (500R) adjustable resistance so that the voltage at the two points of 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 sound quality
7. The static current of the large tube is 100MA: adjust the adjustable resistance VR2 (1K) so that the voltage at the two points of A and B is 22MV, then the static current I=22MV/0.22R resistance is 100MA; if the customer heat sink is large enough, you can make Increase the static current, generally 100MA-300MA sound effect.
Feature:
* Use original ON Semiconductor MJ15024G/MJ15025G and Toshiba 2SA1930/2SC5171
* Inter-stage coupling capacitor uses WIMA capacitor 1UF, natural sound, wide sound field
* The current advanced C1237 BTL speaker protection circuit is used to effectively eliminate the impact sound of switching on and off and the DC output protection function to make your speakers more secure.
Package:
1 pair
E505 Amp Board
Payment Meth
od:
Pa
y
Pal preferre
d
Shippment:
1. Shipping to international by China Post Airmail, every parcel will be registered w
ith 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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