We can supply pre-populated circuit boards with high quality components. We use metal film resistors where appropriate for good noise performance.

These PCBs were designed by John Widgery in the 1980s as replacements for ageing boards in Series 3 STA15/25s. They are also similar to the boards found in the Mk4, though missing the modified biasing circuitry employed in these later amplifiers.

They are slightly refined compared to the original 1960s boards,with an improved layout and pad spacing to fit modern components.

Download wiring diagram »

If you require any of these parts, we will be happy to discuss your requirements if you contact us via the address below.