This project was built as a demonstrator. This amp can be demonstrated either in our Porirua electronics lab, or brought to your location to audition.
This amplifier can be ordered at a cost of $NZ 2200
Its features are:
- Remote control volume, input selection and standby power
- Tone controls
- Phono input
- Small footprint chassis
- 15 wpc output
Also, this amplifier was constructed entirely on printed circuit boards, to enable easy re-use of the modules in subsequent projects.
Around the back
Inside
Everything is hand built and assembled (except for the green boards which are outsourced components for the remote control)
Specifications
Main Amplifier
Topology
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Line-level amplifier, grounded cathode gain stage, DC-coupled
cathodyne phase inverter, push-pull EL84 output in class AB using fixed-bias ultralinear topology, global negative feedback. 360V Plate Voltage. |
Valve complement
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Gain stage: 1 X 6N2
Phase Inverter: 1 X 6N1 Output: 4 X EL84 |
Power Output (measured)
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15W RMS both channels driven, 1kHz continuous, resistive load
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Distortion (measured)
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1.5% THD at rated power, 1kHz, resistive load
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Output Impedance
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4Ohm 8Ohm
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Input Impedance
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500 KOhms
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Input Sensitivity
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1v rms for rated power (2.8v p-p)
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NFB
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10dB
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Frequency Response
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10Hz – 24kHz ±1dB
6Hz – 32kHz ±3dB
-6dB at 50kHz
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Power consumption
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230v 50Hz 190w nominal
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RIAA Phono Preamp
Sensitivity |
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Gain |
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Freq Response |
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Topology |
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Tone Control
Topology
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unity-gain cathode-follower driven baxandall tone stack with NFB
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Valve complement
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2 X 6N2
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Tone adjustment
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±12dB at 100Hz and 10 kHz
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