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LJ 2x25W Class-A JFET-MOSFET Single-ended Amplifier (Pass Aleph J)
LJ 2x25W Class-A JFET-MOSFET Single-ended Amplifier (Pass Aleph J)
Rp10.500.000
This is 2x 25W JFET-MOSFET class-A single-ended custom amplifier by LJ Audio, with dual input (XLR true balanced or RCA single-ended). Custom made only, approx lead time: 3 weeks.
- Model: Aleph J clone Ver #1, Jan 2014 (protoyype).
- Design:
- Adapted from FirstWatt Aleph J by Nelson Pass. The original Aleph J is based on the circuit design of the Aleph series. It is a two stage concept with a p-channel. JFET differential amplifier with a current source at the input and a single ended class A output based on the active current source concept with two identical output stages in parallel.
- Aleph J circuit (There are differences between the Aleph J and its predecessors.):
- Improved power supply filtration with about 20dB less voltage ripple.
- Reduced gain on the active current source, giving better overall performance into 8-16 ohm loads.
- Input stage using high quality matched JFETs.
- Much higher input impedance and vanishing capacitance.
- 15dB less negative feedback.
- Even greater stability, operating without lag compensation.
- 15dB less noise.
- No electrolytic capacitor in the signal path.
- Circuittry and technical stuff at www.firstwatt.com
- Original specification (based on the published technical data of original Firstwatt Aleph J, measured at 8Ω load):
- Input Impedance: 242 kΩ (RCA input).
- Damping Factor: 20.
- Output Power: 25W with 1% THD at 1kHz, 30W clipping.
- Gain: 19.6dB.
- Input for 25W output: 1.5V.
- Maximum output voltage: ±21V.
- Maximum output current: ±2.5A.
- Noise: 100μV unweighted, 20Hz-20kHz..
- Power consumption: 200 watts.
- Fuse: 3AG slow blow or 4 A (120VAC), 3AG slow blow or 2 A (240 VAC).
- Features:
- Dual input: XLR true balanced and RCA single-ended.
- Loudspeaker protector module with triple protection TFX PGX-600S.
- Soft start module (anti inrush current) TFX ASX-2200.
- Triple fan (inflatable fan, and suction fan) controlled by thermal sensor.
- Separated (independent) PSU each channel (dual transformer, dual rectification and filtering).
- "Killer" capacitance filter: 312.000uF.
- Full body aluminium heatsink.
- Key Parts/Components:
- Very low noise J-FET: 2SJ74.
- Power MOSFET: IRFP240 (HEXFET, vertical).
- Rectifier: 16x MUR1560 with heatsink (downgradeable option).
- Resistor: TKD (Japan), Takman (Japan), Dale (USA).
- Capacitors (upgradeable option): Vishay Roedersein, Elna, Panasonic, Bennic FPP.
- Transformer: LJ custom trafo.
- Heatsink: Aluminium full body.
- Connector: Neutrik XLR, gold plated Vermouth RCA and binding post.
- Chassis: custom aluminium chassis with 10mm acrylic panel.
- Construction: PCB (fibre glass, dual layer thru hole, gold plated).
- The parts and components are subject to change.
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