The original
A21 amplifier was hailed by many leading authorities as the most significant
advance in amplifier design technique for many years.
The Series
Two version incorporates certain improvements to the original model, including
increased power output, improved input sensitivites and disc overload factor,
headphone socket, nad superb new styling.
Construction
is to very high standards, and the interior illustration indicates the neat
layout. High quality components only are used to ensure long term reliability -
note particularly the large electrolytic capacitors and mains transformer which
immediately instill a feeling of confidence.
Unconditionally
stable, superbly styled, a nd elegantly presented in a handsome teak case, this
amplifier sets entirely new standards of high quality reproduction not only
withinm but well beyond its price range.
Power Output
The rated
power output of 12 watts RMS per channel is more than adequate for the vast
majority of domestic situations even when using relatively insensitive
loudspeakers. Once again it must be stressed that it is the quality of the
watts which is important. With the current trend towards lower impedance
loudspeakers, the A21 series two has been designed to produce its full output
into 8 ohms, although it may be used with absolute safety to drive loudspeakers
of higher impedance (at reduced total output)
Specifications
Power
output: 12 watts RMS per channel (24
watts RMS both channels simultaneous operation)
at clipping level into 8 Ω
Output to
Tape Recorder: Direct connection from
raadio and aux, inputs, 150 mV from disc amplifier when correctly loaded.
Input
Sensitivity
Magnetic
cartridge : 2,5 mV into 68 k Ω,
equalized to RIAA
Caramic
cartridge : 50 mV into special input
circuit
Radio, Tape,
Aux : 150 mV into 200 k Ω flat response
Overload
Capabilities: 25 dB on disc inputs;
infinite on radio, aux, and tape inputs
Total
Harmonic Distortion: better than 0,25%
at 10 watts, mainly 2nd and 3rd harmonic, negligible proportion of high order
harmonics and reducing in proportion with reducing power to give less than
0,01% at 1/2 watt - i.e. the average
power listening level.
Frequency
and Power response: 30 Hz to 20 kHz ±1
dB
Signal-to-Noise
Ratio:
Radio, tape,
Aux : 80 dB
Disc : 70 dB
Interchannel
Crosstalk: typically 40 dB 20 Hz to 19
kHz, dependent upon input load impedance
Control
Knobs
Bass : ±14 dB at 40 Hz
Treble
; ±14 dB at 10 kHz
Volume: Logarithmic (channel balance ±1 dB maintained
to 50 dB attenuation)
Balance
: ±6 dB for 180° rotation, either
channel eliminated at limits of rotation
Push Buttons
to select
Inputs
: Disc, Radio, Aux, Tape
Rumble
Filter : Built in on disc input, 18
dB/octave below 30 Hz
High
Frequency Filter : 12 dB / octave above
7 khz
Function
: Mono, Stereo, Input Right, Input Left
Power
Consumption: 70 watts max
Dimensions
(W x H x D): 394 x 127 x 229 mm
(15-1/2" x 5" x 9")
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