The origins of an interest
Around 1976 I built a set of KEFKIT 3 speakers. These were based on the highly regarded KEF CONCERTO speakers from the late 60s/early 70s. The Concerto was a vented speaker box of 62 litres (64 pounds weight), fitted with three drive units - the T27 (high frequency), B110A (mid) and B139 (low). I built it according to my own specifications with cladding to match furniture in the room.
The specs of the units are as follows: LF Unit- B139 Type SP1044; MF Unit B110 Type SP1003; HF Unit T27 Type S1032; Dividing Network - DN12 Type SP1004, 400Hz and 3500Hz.
Although an electronic engineer by initial academic qualification I did not ever become a professional engineer. For various reasons, after graduation, I continued in the world of education and after a few professional twists and turns I specialised in the developing world of computers and the information technologies and their uses and applications in learning and teaching. I would not class my self as an expert in the field of loudspeakers. I am perhaps just a relatively capable enthusiast in things technological.
In the late 1990s, and following an interest of the moment, I upgraded my speakers in various ways including fitting new cross-overs, new internal wiring, external binding posts, and spikes. The speakers also now sit on concrete slabs which are surrounded with wood (for aesthetic purposes). Felt pieces on the bottom face of the stands protect the wooden floors. The speakers are now incredibly easy to move - they just glide over the floor. A significant sound improvement was noticeable at most stages of development. My Naim amps with Naim NACA5speaker cabling made the speakers sing.
Initially I worried that the highly priced speakers available in hifi specialists may be significantly better but after various listening tests I became convinced that I have indeed a fine pair of high quality speakers.
The engineer within is forever planning design improvements to these speakers and to all the others I tell myself I am going to build. The implementation is however another matter - too often it is left at the planning stage.
Initially I published a few pages about my KEFKIT3 speakers and they brought me enquiries from around the world as so little information seems to be available about the KEF speakers of that time, their drive units and their crossover circuits. In order to make it easier for people to gain access to basic information about the 1960-1970s KEF C Series speakers and their drive units. I then had the idea of creating a more comprehensive website which would contain any information I managed to acquire. That explains the background to this site. If you have any pertinent information which you feel would be of interest to others please let me know and I will publish it here. This of course also includes pictures of your cherished vintage KEF speakers.
Leaflets issued with the KEFKIT3 are reproduced here for online viewing.
Leaflet entitled KEFKITS published by KEF Electronics (KK/3 GA6802/20M/4.75). This contains information about KEFKITs generally and about KEFKITs 1 and 3 in particular.
Leaflet entitled KEFKITS published by KEF Electronics (no leaflet number). This contains information about KEFKITs generally and about KEFKITs 1 and 3 in particular.
Leaflet entitled ASSEMBLING KEFKIT3 published by KEF Electronics (GA6990/5M/1175). This contains information relating to the construction of a KEFKIT3.