Quad 22 Control Unit & pair of Quad II Monoblock Power Amplifiers

Here we have a classic vintage pairing of a control amplifier and a pair of mono valve power amplifiers from British stalwarts Quad. Originally launched in 1959, when it was considered a masterpiece of industrial design, the Quad 22 Control unit or pre-amplifier continued until 1967 by which time approximately 30,000 units had been sold. The matching Quad II power amplifiers actually pre-dated the control amplifier being launched in 1953 with production ceasing in 1970 when their numbers reached approximately 90,000. It should come as no surprise therefore that our examples have a few signs of wear but they are far better than many we have seen. They are in full working order and come with our usual three month warranty. There is also a bundle of paperwork, both original and from Quad for servicing since.
Quad Say….
The Quad 22 Control unit provides full facilities for either mono or stereo operation. Used with one power amplifier the Quad 22 provides full mono facilities; used with two power amplifiers it provides for both mono and stereo; both channels may also be used for mono when required, by pressing the “2 MON” pushbuttons.
Three easily distinguished types of control are used for the three main functions of selecting programme, adjusting volume and modifying signal as to tone, range, etc. The Control unit Is compact, easily mounted (or may be used free standing if preferred) and combines simplicity and rigidity with a “clean” finish.
The six pushbuttons perform 10 different functions, all clearly marked. Two provide for selection of stereo or mono. or two channel mono, and also switch the second amplifier on or off as required. The other four select the programme source in either stereo or mono from radio, microphone, disc (with 4 different equalisation characteristics) or tape.
Sockets are provided for permanent connection of all radio tuners, pickups, tape recorders, etc… used with the unit.
Plug-in adaptor units enable any pickup to be matched accurately and a chart Is provided showing the pushbutton combination required to provide correct equalisation for different makes of record, old and new. Tape recordings (mono or stereo) may be made without affecting normal listening to the programme being recorded, and replayed either via the tape recorder pre-amplifier or direct from the head with compensation for any characteristic.
Specifications:
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.02%
Input sensitivity: 1.5mV (mic), 0.4mV (MM), 70mV (line)
Signal to noise ratio: 70dB (line)
Output: 250mV (line), 1.4V (Pre out)
Valve complement: 2 x EF86, 2 x ECC83
The QUAD II power amplifier contains no controls and may therefore be mounted inside the cabinet, leaving only the control unit panel (and that of the radio tuner it fitted) visible on the outside. Stability, and hence performance, are entirely independent of signal or load conditions and the amplifier is therefore suitable for use with any loudspeaker arrangement.
The performance specification is fully maintained with random replacements from normal valve stocks without the need for matching or alignment of any kind, and the output stage uses the now traditional QUAD cathode coupled arrangement combining low distortion with an efficiency which is reflected in the compact size of the equipment.
Power Output: 15 watts throughout the range 20-20,000 c/s
Input Sensitivity: 1.4 VRMS for 15 watts output
Frequency Response: Dimensions: 13 x 4′ x 6½’
Weight: 8.3 kg