Kits and Mods

SCK Sag Control Kit     $93

Power supply voltages drop when the limits of available current are approached. This phenomenon, called "sag", is caused by the internal resistance of the power supply components. The SCK uses variable current limiting to introduce controlled sag into the system operation. The panel control can be mounted on the front or rear of the amp, or internally as a preset. On its own, it is connected between the rectifier and filter caps. Alternatively, it can be connected directly following our earlier power sclaing kit, the PSK-1. The SCK cannot be used with cathode-biased or high-bias fixed-biased amps. These have negligible dynamic range in their current draw, which is what the SCK responds to. The SCK can also be used as a variable current limit in a bench power supply, wired between the PSK-1 and the output filter caps, with limiting from 700mA down to zero. The layout uses eyelet construction; the materials and instructions for this are available in the CCK Circuit Card Kit.