What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Sugden A21 serie Two amplifier

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)

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")
Weight:  11,3 kg (24 lbs)

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