Features of the power amplifier board:
(this is the price for one board, without heat sink, without transformer)
Voltage amplification with LME49830, with Toshiba's original 2SA1930/2SC5171 for current amplification pre-driver with TL071 for DC servo, cancel the negative feedback capacitors, the real DC amplification current output stage with five pairs of East 2SJ201/2SK1530 rate tubes, low output impedance, power margin, closer to the ideal amplifier; power tubes can be customized according to customer requirements. The power tubes can also be customized according to customer requirements.
There is a perfect mid-point voltage protection circuit, speaker delay protection circuit, the main chip is made in Japan UPC1237, the integrated circuit is stable and reliable.
Amplifier board has a temperature protection circuit, when the board temperature control circuit detects the temperature of the heat sink of the amplifier board more than 75 degrees, the amplifier board automatically reduces the signal output and the current amplifier tube quiescent current to the minimum, so as to effectively protect the amplifier board, until the temperature of the heat sink drops below 75 degrees, the amplifier board to return to normal operation, without human intervention.
Voltage stage / current stage power supply is designed separately, voltage amplification stage power supply with lower internal resistance of the parallel regulated power supply, so as to avoid the impact of power fluctuations on the front of the current stage of large dynamic, to minimize the sound pollution.
Double-sided 2mm fiberglass PCB, 1% precision metal film resistors, US mica capacitors, German ERO thin film capacitors, French high-voltage electrolytic capacitors, all key components are guaranteed brand new and original imported, avoiding second-hand goods.
PCB size: 298.5 x 93.5 mm
Electrical characteristics:
Working condition: Class A and B
Output power: 400W*(4Ω)<* V=±60V>
Operating voltage: Recommended voltage driver level DC ± 55V / current output level DC ± 50V, speaker protection: AC 20-24V
Input interface: mono signal input
Output interface: Mono speaker output
Power supply mode: Dual power supply mode, voltage driver and current output stage separate power supply
Packaging:
1pc LME49830+2SK1530+2SJ201 installed FI-FI pure rear stage 400W mono power amplifier board
