This also reduces the switch contact pressure and causes intermittent normalling, more of which in a moment. The contacts become stretched and weak as a result. In addition to not forming a correct electrical connection, plugging a domestic jack into a GPO socket may well cause damage to the socket. It is important to note that, although a GPO jack has a similar quarter-inch sleeve diameter to the domestic (or A-type) jack found on instruments and guitar leads, the ring and tip are very different, and the two are physically incompatible. This type of connector is still used today in full-size professional audio jackfields and serves the same purpose as the telephone exchange: manually routing signals from one location to another.
Variants of these original types later gained the additional designation of 'B type', 'GPO B' or 'BPO'.
In the UK, the connectors were designed by the General Post Office and termed GPO jacks. In those days, to place a telephone call, the user called the operator who then physically connected the call by means of patch cables in a jackfield. Patchbays, also known as patchfields or jackfields, hail back to the bygone days of manual telephone exchanges. In this part, I would like to build on these concepts by covering the theoretical and practical aspects of patchbays. In my two previous studio installation articles (SOS September and November 2002), I've looked at soldering and wire preparation techniques, basic signal types and ground loops. Plus, tips on building and fitting racks for your gear. A patchbay can make your studio much quicker to use, but can also be a nightmare to set up, so here's advice on which to choose and how to connect it up for the best results.
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