Naim NAP250 Power Amplifier / NAC32 Pre Amplifier / SNAPS Power Supply

NAC 32 Pre Amplifier
We consider the most important circuit in a preamplifier to be the phono input stage. This must be designed to accept the output from a pick-up cartridge without loss of information. To achieve this it is necessary to consider the total output of the cartridge and also the effect of its impedance on the circuit. In our preamplifiers we have employed a new concept. The initial preamplifier stage is linear with a small gain; equalisation being divided into two parts. Complete theoretical and practical stability is attained, with a much wider open loop bandwidth than is normally possible. The resultant overload capability is maintained over the whole audio bandwidth.
Our 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, due partly to the excellent stability and overload margin of the preamplifier and partly to its outstanding transient handling capability.
The NAC 32 stereo control unit is complex in terms of both facilities and electronic design. Facilities consist of volume and balance controls, and selector for two phono, one tuner and two tape inputs. The tape sockets have input/output connections, and the tape monitor switch has a mute facility. Tape inputs are buffered and the outputs are fed from a 600 ohm source. The tape monitor facility is automatically switched between tape 1 and tape 2, with tape 1 having precedence.
No. 1 phono input is suitable for moving coil cartridges, and no. 2 phone input is suitable for high output magnetic cartridges.
There are two main output sockets. The NAC 32 also has a mono/stereo switch which operates on all outputs.
Internally the NAC 32 consists of a mother board with eleven daughter boards interconnected with gold-plated precision connectors.
The preamplifiers have phono sockets for interconnection with pick-up cartridges, and locking DIN sockets· for all other connections.
Delayed switch-on circuitry provides thump-free turn-on.
SNAPS Power Supply
An adequate and correctly designed power supply is extremely important for the performance of the pre-amplifier. The SNAPS has two 24V outputs, one of which supplies the preamplifier, while the other may supply a crossover.
NAP 250 Power Amplifier
The purpose of an audio amplifier is to drive loudspeakers without loss of musical information. In our view many commonly accepted parameters have little to do with loss of information and in some instances, such as the pursuit of large bandwidths or low distortion, unqualified acceptance of them can actually lead to the creation of mechanisms that cause loss of information. Dynamic output impedance, open loop bandwidth, slew rate, propagation delay and stability margins are only some of the many other factors to which we attach importance, and which must all be brought into positive balance.
To this end our amplifiers not only achieve low harmonic distortion, low noise and wide power bandwidth, but also have a constant dynamic output impedance over the whole audio bandwidth. They are able to drive reactive loads with phase angles of -90° to +90° without any appreciable change in distortion, and are not sensitive to the absolute impedance of the load.
The frequency response of our amplifiers at the bass end is dependent on the gain decoupling capacitor, and the half power bandwidth extends to below 5Hz. At the top end the response is controlled by a passive single pole filter and is 3dB down at 40kHz. The amplifiers do not slew rate limit within this frequency bandwidth.
The amplifiers will tolerate any load from 0 ohms to infinity without damage or instability since output stages are S.O.A. protected at all times. Prolonged running conditions of high dissipation will cause the amplifier to become quite warm, and should the case temperature exceed 70° C the mains supply will be interrupted until the amplifier has cooled down.
The case of the NAP 250 is constructed of heavy aluminium extrusion which acts as the heatsink. All connections are on the rear. It has large toroidal mains transformers, and power supply components are all secured firmly to the base plate of the case. I also has four regulated power supplies, each of which is capable of 10 amps at 40 volts continuously.
High quality components have been used throughout, with great attention to detail construction. Enclosed cermet presets and tantalum capacitors are mounted on epoxy glass printed circuit board, and each small signal transistor is mounted on a pad.

NAC 32
Input Sensitivities: Phono 1, 100 μV, 470 Ω; Phono 2, 2 mV, 47 kΩ; Tuner, Tape 1 and 2, 75 mV, 100 kΩ
Output Levels And Impedances: Tape 75 mV, 600 Ω: Main outputs 1 V, 47 Ω
Overload Margins: 40 dB on all inputs at all audio frequencies
Dimensions: 214 (W) x 300 (D) x 76 (H) mm
SNAPS
Dimensions: 214 (W) x 300 (D) x 76 (H) mm
NAP 250
Continuous Power Output: 70 W into 8 Ω
Transient: 400 VA
Sensitivity: 1.6 V
Impedance: 22 kΩ
Operating temperature: 0 to 50°c
Mains supply: 240V or 120V
Dimensions: 430 (W) x 300 (D) x 76 (H) mm

Turnaround

Orders will usually dispatched within 2 working days of receiving cleared payment.

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