Naim NAC 62 Pre Amplifier (1988)

The pre-amplifier has a very complex task. Input circuitry must accept the whole output of the source component without being overloaded. Frequency response and level of input signals must be normalised. The signal fed to the power amplifier then needs further conditioning to ensure that the amplifier is never driven outside its operating parameters. The pre-amplifier must also enable the user to select between inputs, and control their level.
The first stage of our phono input circuit is linear with a small gain, and RIAA equalisation is divided into two separate parts. We thus obtain complete theoretical and practical stability with a much wider open loop bandwidth than is normally possible. The resultant overload capability Is maintained over the whole audio bandwidth.
Experience has shown that tone controls and filters do not improve the musical performance with a system of this calibre, even when playing old and dirty records. This is due partly to the excellent stability and overload margin of the pre-amplifier, and partly to its outstanding transient handling.
The NAC 62 Pre-Amplifier
This is a simple pre-amplifier designed to meet the basic requirements of the serious audiophile. Facilities are limited to a phono input with a choice of input boards, tuner, auxiliary, tape, and a monitor /mute switch. The pre-amplifier is available with input boards to suit either low output moving coil cartridges (NAC 62S), Linn Karma and Troika (NAC 62K), high output magnetic cartridges (NAC 62N) or variable high level (NAC 62V).
Internally the NAC 62 comprises a mother board having on it the high level audio circuitry, and two daughter boards containing the input stages. The boards are interconnected with gold-plated precision connectors.
Power Supplies
An adequate and correctly designed power supply is extremely important for the performance of the pre-amplifier. A separate power supply is not required when our pre-amplifiers are used with the NAP 90 or 140, but optional use of the SNAPS 24 V supply offers the benefit of a larger and quieter power source.
The HI-CAP offers even better performance. This is a much larger dual 24 V supply for use with -5 pre-amplifiers, the NAC 62 or the NAXO 2-4 or 3-6 crossover. An alternative socket is provided for earlier pre-amplifiers or crossovers.

Input Sensitivities: NA 323K: 100μ,V, 560 ohms. (type K); Tuner, Auxiliary, Tape 1 and 2: 75 mV, 10 kOhms.
Output Levels And Impedances: Tape 75 mV, 600 ohms, Main outputs 1 V, 47 ohms.
Overload Margins: 40 dB on all inputs at all audio frequencies.
Size: 205 (W) x 300 (D) x 76 (H) mm

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