Quad 306 Power Amplifier

Peter Walker founded the Acoustical Manufacturing Co. in 1936, and since then all Quad products have displayed originality in design, and over the years, made a major contribution to the improvement of sound quality. Our 306 is in good overall cosmetic condition for its age and is fully working – we have replaced the main capacitors. It will be professionally packaged, coming with manual and as always, our standard 3 month warranty.
Quad Say….
The Quad 306 is a high quality stereo power amplifier primarily intended for use in very high quality sound reproducing systems. It would normally be used in conjunction with a Quad control unit though other signal sources could be accommodated.
The 306 uses a current dumping output circuit, a Quad invention which eliminates many of the problems associated with transistor amplifiers and is covered by patents in several countries. In a current dumping amplifier, there is in effect both a low power very high quality amplifier and a high power heavy duty amplifier. The low power amplifier controls the loudspeakers at all times calling on the high power amplifier to provide most of the muscle. The low power amplifier is so arranged – it carries an error signal- that provided the larger power transistors (the current dumpers) get within the target area of the required output current it will fill in the remainder accurately and completely. The reproduced quality is solely dependent on the small amplifier which because of its low power can be made very good indeed.
Problems of crossover distortion, quiescent current adjustment, thermal tracking, transistor matching all disappear. There are no internal adjustments or alignments, and the choice of power transistor types is less restrictive.
The performance of the Quad 306 amplifier is as accurate as it is possible to achieve by careful design, selection of components and rigorous test procedures.
Features:
High quality stereo power amplifier using the patented Quad ‘current dumping’ circuit.
Designed to be used in conjunction with Quad control units /pre-amplifiers.
Adequate output power for normal installations.
Specifications:
Controls: On/Off
Input: 375mV from control unit/pre-amplifier
Output: 50w sine per channel into 8 ohms
Dimensions: 321 (W) v 207 (D) x 64 (H) mm
Weight: 5.7Kg
Finish: Grey
Audio Sockets: Phono
Speaker Sockets: 4mm banana