C5200 A1943 Power Amplifier Board 1300W 24 Transistors JRC5532D Audio Amp

24-transistor high power amplifier board with 12 pairs of C5200/A1943 Toshiba output transistors (150W/230V/15A per pair) and JRC5532D low-noise op-amp driver. Delivers up to 1300W output. Ideal for professional stage audio, large KTV systems, home theater main amps, DIY high-power sound systems

C5200 A1943 Power Amplifier Board Application features:

◆ Core Configuration

• Output stage: 24 power transistors (12 pairs of C5200/A1943)

• Driver stage: JRC5532D low-noise dual op-amp

◆ Transistor Parameters (C5200/A1943)

• Type: NPN/PNP audio complementary pair

• Collector current: 15A

• Collector-emitter voltage: 230V

• Power dissipation: 150W per transistor

• Transition frequency: 30MHz

• Package: TO-3P/TO-3PL

◆ Op-Amp Parameters (JRC5532D)

• Type: Low-noise dual operational amplifier

• Supply voltage: ±3V ~ ±20V

• Small signal bandwidth: 10MHz

• Input noise voltage: 5nV/√Hz

• Slew rate: 8V/μs

• Output drive capability: 600Ω, 10Vrms

◆ Amplifier Class
Class AB high-power audio amplifier

◆ Output Power

• Peak power: 1300W

• Rated power: 800W-1000W (depends on load and cooling)

◆ Channel Configuration
Mono/Single channel (two boards for stereo)

◆ Load Impedance
4Ω ~ 8Ω

◆ Power Supply Requirements

• Voltage: Dual AC supply (e.g., 35-0-35V to 65-0-65V)

• Current: 10A+ recommended

◆ Typical Applications

• Professional stage audio

• Large KTV sound systems

• Home theater main amplifier

• Subwoofer dedicated amplifier

• DIY high-power sound systems

• Public address systems

• Band performance equipment

◆ Key Advantages

• 24-transistor high-power design for strong output

• Toshiba original audio complementary pair for excellent sound quality

• JRC5532D low-noise op-amp for high SNR

• Ample current headroom for fast dynamic response

• Suitable for demanding audio applications

This power amplifier board is suitable for transformers with main voltage double 40-85V sub-voltage single 12-17V (about 1A)

The main voltage must be rectified before it can be connected to the power amplifier board

Adopting high-frequency transistor circuit design, the driver-level adopts the audio dedicated tube C5200, A1943

The input uses the original imported operational amplifier JRC5532D to act as the power output stage using 11 pairs of imported
Toshiba audio dedicated tube C5200, A1943 parallel output

Technical Parameters:
Output power: 1300W
Frequency response: +0dB/-0.8dB (20Hz~20KHz)
Total harmonic distortion: <0.1% 8Ω 20Hz~20KHz
Signal to noise ratio: (20Hz--20KHz): A weighting, full power output >98dB
Instant Bear Response: 25V/μS
Damping coefficient 8Ω: 10Hz-400Hz: >200
Crosstalk between channels: 1kHz: -76 dB / 20kHz: -58dB
Input impedance: 20KΩ (Balanced)/10KΩ (Unbalanced)
Input sensitivity: 1.25V/4Ω rated power

Notes : Since the prices of the electronic components are unstable, the prices we show are for reference only. Please confirm the recent prices with us before ordering!

Lead Time : Usually, your parcel will be arranged within 7 days after finishing payment. We'll send it more quickly if it's an urgent order. Thanks for your understanding!

Quantity(Pieces)	1 ~ 30000	30001 ~ 300000	> 300000
Est. Time(days)	5	7	To be negotiated

FAQ:

1. What is the C5200 A1943 power amplifier board and its key specifications?
   This is a high‑power stereo audio amplifier board built around 12 pairs of Toshiba 2SC5200 and 2SA1943 power transistors (24 transistors total), paired with a JRC5532D dual op‑amp for the preamplifier stage. The board is advertised with a peak power of 1300 W, but the actual continuous (RMS) power depends entirely on the supply voltage and speaker impedance. With a typical ±70 V dual DC supply and 4 Ω speakers, it can deliver approximately 250 W – 300 W per channel (RMS). It requires an external toroidal transformer, rectifier/filter board, large heatsink, and speaker protection circuit. This is a pure analogue Class‑AB amplifier, prized by DIY enthusiasts for its warm, detailed sound and massive power capability.

2. Is the 1300 W power output real? What is the true continuous power?
   The 1300 W figure is a peak (PMPO) marketing specification — the maximum possible transient burst, not the continuous usable power. The true RMS power depends on the supply rails. For example, with a ±60 V supply into 4 Ω, each channel delivers about 200 W – 220 W RMS; with ±70 V into 4 Ω, you can achieve roughly 250 W – 300 W per channel before clipping. The board’s 24 transistors provide enormous peak current capability, but the continuous power is limited by the power supply and heatsinking. For realistic home audio, this is still a very powerful amplifier.

3. What power supply does the C5200/A1943 amplifier board need?
   The board requires a dual (symmetrical) DC supply: V+ (positive), GND (ground), and V‑ (negative). The recommended voltage range is ±30 V to ±70 V. To achieve full power, a toroidal transformer rated at 500 VA – 800 VA with dual secondaries (e.g., 50 V‑0‑50 V AC) is typical. You must add an external rectifier bridge and large filter capacitors (at least 10,000 µF per rail) — the board itself does not include rectification or filtering. A separate regulated ±12 V – ±15 V supply is often needed for the JRC5532D preamp stage, which can be derived from the main rails via resistors and zener diodes or a dedicated regulator.

4. How do I connect speakers and an audio source to the board?
   The board has screw terminals or solder pads for power input (V+, GND, V‑), speaker outputs (L+, L‑, R+, R‑), and an audio input (usually a 3‑pin header or RCA jacks for left/right). Connect a line‑level source (CD player, preamp, Bluetooth receiver) to the input. The JRC5532D preamp requires its own low‑voltage supply, which must be connected separately if not already integrated on the board. Always wire the speakers after the amplifier is powered off and discharged. It is strongly recommended to use a speaker protection module (with DC detection and turn‑on delay) between the amplifier output and the speakers to prevent damage.

5. How does this Class‑AB amplifier compare to a Class‑D amplifier?
   This board is a Class‑AB design, which offers excellent audio linearity and a “warm” sound character, but with lower efficiency (50 % – 70 %). Class‑D amplifiers are much more efficient (> 90 %), smaller, and lighter, but some audiophiles still prefer the natural tonality of a well‑built Class‑AB amplifier. The C5200/A1943 board excels in high‑fidelity home audio, studio monitoring, and hi‑fi subwoofers where sound quality is the priority and size/heat are acceptable trade‑offs.

6. What cooling and heatsinking is required for 24 power transistors?
   With 24 TO‑3P/TO‑264 transistors, substantial cooling is mandatory. All transistors must be mounted on a large aluminium heatsink (at least 0.4 °C/W thermal resistance or better) using mica or silicone insulators and thermal paste. For continuous high‑power operation, a forced‑air fan is highly recommended. Insufficient cooling will cause the transistors to overheat and fail within seconds. Always mount the heatsink in a well‑ventilated enclosure.

7. Does the board have built‑in protection against short circuits or DC offset?
   No. Most bare C5200/A1943 amplifier boards do not include any protection circuitry. You must add an external speaker protection module (which provides DC offset detection, turn‑on delay, and sometimes over‑current protection) and fuses or circuit breakers on the DC supply rails. Without these, a single transistor failure can send the full rail voltage to your speakers, destroying them instantly. Always test the amplifier with a cheap dummy speaker first.

8. What is the role of the JRC5532D op‑amp? Can I upgrade it?
   The JRC5532D is a low‑noise dual operational amplifier that acts as the input preamplifier / gain stage. It amplifies the line‑level audio signal before it reaches the power transistor stage. You can replace it with other compatible dual op‑amps such as the NE5532, OPA2134, LM4562, or MUSES8820 to alter the sound signature (warmer, brighter, more detailed). Ensure the replacement op‑amp is rated for the preamp’s supply voltage (typically ±12 V to ±15 V). This is a popular and simple upgrade path.

9. Can this stereo board be bridged to create a more powerful mono amplifier?
   Yes, it is possible to configure the two channels in bridge‑tied load (BTL) mode by feeding one channel an inverted signal. This approximately doubles the voltage swing and can deliver around 500 W – 600 W RMS into 8 Ω (with adequate supply). However, bridging requires a balanced input signal or an external phase inverter, and it stresses the output transistors more. It is not a beginner‑friendly modification; consult the board’s schematic and ensure the heatsink can handle the extra heat.

10. What are the most typical applications for the C5200/A1943 amplifier board?
    It is a favourite among DIY audio enthusiasts for building high‑power stereo integrated amplifiers, powered subwoofers, home theatre systems, live sound PA amplifiers, and studio monitor amps. Its huge power headroom and classic analogue sound make it ideal for driving large floor‑standing speakers, bass shakers, and high‑SPL setups where a warm, dynamic presentation is desired.