QUAD 22 Preamplifier (QUAD 22 Control Unit)

Details: Written by: Grzegorz Makarewicz; Category: Gallery; Last Updated: 15 December 2025; Hits: 728

Grzegorz "gsmok" Makarewicz (2018-01-08), This email address is being protected from spambots. You need JavaScript enabled to view it.

The QUAD 22 preamplifier was designed to work with one (mono system) or two QUAD II amplifiers. Its capabilities, and in particular the replaceable external modules, predisposed it to act as a control device for an audio system. This was reflected in the name of this device, which described it not as a typical preamplifier but as a control unit (the full, original name is: "The QUAD 22 Control Unit".

Due to the fact that even the user manual is common to the QUAD 22 preamplifier and the QUAD II amplifier, the photographic presentation begins with several shots of a complete audio system designed for stereo reproduction.

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After several photos of the entire set, the next drawings show the hero of the description, i.e. "The QUAD 22 Control Unit".

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Now a few photos of the set, with "dressed" power amplifiers and a "naked" preamplifier.

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We're done with the amplifier at this point, and here are the first details of the preamplifier's interior. Top view after sliding it out of the case.

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And these are the operating instructions that used to come with devices. It really brings a tear to my eye.

Cover of the user manual

Below is a basic schematic diagram of the preamplifier. It does not contain externally connected modules. The diagram can be enlarged by clicking on it with the mouse.

Schematic diagram

For the more curious, I am including drawings that link the location of the components to the schematic diagram. They come from the preamplifier's user manual. As with the schematic, they can be opened in an enlarged and therefore more legible form.

Location of elements