The TBS provides an easy installation of a tracking bias supply for fixed-biased amplifiers. The proportion of bias voltage to tracked voltage is easily adjusted using the trimpot on the TBS card.

TBS works best with a low-impedance raw bias supply. This can be a winding on the existing power transformer, or through use of the RBX Raw Bias Auxiliary supply kit. Also, see the article "Raw Bias Supply Modifications" on this site in the Technical Articles section.

TUT2, TUT4 and TUT6 explain how to use regulated bias supplies and the special performance capabilities this can add to an amp.

If your stock amp is cathode-biased, add the RBX and TBS to have fixed-bias. You can still switch between cathode bias and fixed-bias using one of the methods outlined in the TUT-series. Use the TBS to "convert" an SB-2 into an SB-1, or to convert an SF-2 into an SF-1.

PCB dimensions: 1.15 x 0.8", 29 x 20mm

Kit includes notes with installation tips + layout and schematic diagrams of the kit.

For more info, see "Selecting a Power Scaling Kit".