LJM L20.5 KEC Amplifier Modules (Pair)

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The LJM L20.5 KEC amplifier module is based on 4 pairs of KEC PNP KTB817 and NPN KTD1047 transistors. It therefore operates in class AB and is capable of developing an output power of up to 400W into 4 ohm or 200W into 8 ohm and an output current of up to 15A, while maintaining an ultra-low noise level with a THD+N of 0.001% (A-weighted).

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Reference : 19953
New product

49,90 €tax incl.

41,58 € tax excl.

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Shipping date: 14-11-2024.

Orders placed before 12h (GMT+1) will generally be shipped the same day (working day).

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Facturation France
SAV France

2 Years warranty

Accessories for this product

Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.

 
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LJM L20.5 KEC Amplifier Modules KTB817 KTD1047 Class AB 2x400W @ 4 ohm (Pair)

LJM L20.5 KEC picture

The LJM L20.5 KEC amplifier module is based on 4 pairs of KEC PNP KTB817 and NPN KTD1047 transistors. It therefore operates in class AB and is capable of developing an output power of up to 400W into 4 ohm or 200W into 8 ohm and an output current of up to 15A, while maintaining an ultra-low noise level with a THD+N of 0.001% (A-weighted). The module also features a cascade input and a CFP (Complementary Feedback Pair) output. The gain stage is based on 3 transistors: KB1369, H669A and KD2061. For powering the module, we recommend using a voltage of +/-24V to +/-63V via the terminals provided. Signal input is via a screw terminal block, and amplified signal output is via terminals.

This amplifier module needs to be coupled to a HP protection module. LJM, for example, has a 63V 4700uF protection module available here.

LJM L20.5 KEC module overview

LJM L20.5 KEC module overview
1AC power input
2Amplified signal output
3Signal input
42 pairs of KB817 transistors
52 pairs of KD1047 transitors

The GND terminal shares the GND of the power supply and the negative pole of the loudspeaker.

Examples of wiring diagrams for LJM L20.5 KEC modules

Below are wiring examples for LJM L20.5 KEC amplifier modules with HP 63V 4700uF power supply and protection module.

Examples of wiring diagrams for LJM L20.5 KEC modules
LJM L20.5 KEC module mounting hole coordinates

Technical characteristics

Specifications
Product typeAmplifier module
Amplification classAB
Transitors4x KEC PNP KTB817
4x NPN KTD1047
Channels2 (1 by board)
InputAnalog input on screw terminal block
OutputOutput on terminals
Output power2x400W @ 4 ohm / 2x200W @ 8 ohm (power supply +/-63V)
2x250W @ 4 ohm / 2x125W @ 8 ohm / 2x500W @ 2 ohm (power supply +/-50V)
Input sensitivity2V
Max. output current15A
Frequency response20Hz-25kHz
THD+N0.001% (A-Weighted)
SNR> 98dB
Damping factor> 400 @ 8 ohm load
Gainx31
General
Power supply+/-24V to +/-65V
PCB dimensions156 x 49mm
Package1x Pair of LJM L20.5 KEC amplifier modules
8x Crimp terminals
16x Insulation foil for transistors
LJM L20.5 KEC module measurements
 
Data sheet
InputScrew terminals
OutputPCB Connector
Channel2 (Stereo)
ClassClass A / AB
Amplifier chipTransistors
Power (W)400.0
 
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LJM L20.5 KEC Amplifier Modules KTB817 KTD1047 Class AB 2x400W 4 Ohm (Pair)
The LJM L20.5 KEC amplifier module is based on 4 pairs of KEC PNP KTB817 and NPN KTD1047 transistors. It therefore operates in class AB and is...

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