Naim NAC 72 Pre Amplifier (1991)

Here we have a nice classic NAC 72 preamplifier from Naim Audio. It comes in very good condition, especially when you consider its age, with just a couple of very minor blemishes – please see photographs. It is fitted with 323/5 moving coil phono boards and comes professionally packaged with our usual three month warranty.
Naim Say….
The preamplifier has a whole series of complex and vital tasks. Input circuitry must accept the entire output of the source without being overloaded. Frequency response and level of input signals must be normalised. The signal then needs further conditioning ensuring that the power amplifier is never driven outside its correct operating parameters. Our phono circuit has a linear first stage with relatively low gain, after which RIAA equalisation is split into two parts. The simplicity of the solutions then available allows an unusually wide open loop bandwidth together with perfect stability under every operating condition possible. Exceptional overload capability is maintained over the whole audio bandwidth. We do not fit switched filters, tone, or loudness controls. Design at this level makes them superfluous. They can never improve the quality of the signal, and there is a sharp penalty for their use in terms of loss of musical information.
If you have precious but scratched records our preamplification will bring them to life again without degrading the music. The magnetic field radiated by a transformer interferes with sensitive circuits, so our preamplifiers use a remote power supply to ensure faultless performance. Correct earthing is a further advantage. BNC sockets are used for interconnection with pick-up cartridges. We choose them in preference to the more commonly used RCA socket because their impedance is better suited to the majority of arm cables. The precision engineered volume control gives a very large range with both channels closely matched even at the lowest settings. Cermet tracks and precious metal wipers help to ensure a long and trouble free life. Special circuitry delays output until normal operating conditions are reached after switch-on. Our preamplifiers have a frequency response to within 1 dB between 20 Hz and 20 kHz. All distortions will remain below one-thousandth part of the required signal.
The 72 is our most advanced preamplifier with full facilities – two tape inputs, tape monitor, tuner, and two fully convertible inputs for phono, CD, or other ancillary equipment. New enhanced circuitry includes a matched and time-aligned filter. The high quality sound of the 72 can be further enhanced by using a HiCap power supply.
Specifications:
Input Sensitivities:
Adjustable High Level: 72V 25 mV-350 mV, 100 kΩ
High Level: 75 mV, 100 kΩ
Tuner & Tape: 75 mV, 100 kΩ
Overload margins on all inputs at all audio frequencies: 40 dB
Output levels and impedances: Tape: 75 mV, 600 Ω; Main Outputs: 0.775 V, 47 Ω
Case Size: 205 (W) x 300 (D) x 76 (H) mm