The Signal Transfer Company is the only source for PCBs guaranteed to comply with the power amplifier design philosophy pioneered by Douglas Self. The crosstalk performance of preamplifiers, and the linearity of power amplifiers is often defined by the fine details of PCB layout. An apparently minor error can have dreadful effects on performance. Our PCBs have been designed with meticulous care at every point. The board layouts are precisely the same as those approved by Douglas Self when his famous series of articles appeared. You can therefore be confident that in some respects at least, proper operation is "built-in". We supply the finest quality fibreglass PCBs, double-sided with gold-plated pads. All boards have full solder mask and a silk-screen component layout. Each PCB is supplied with extensive constructional notes, previously unpublished information about the design, and a detailed parts list to make ordering components simple. A range of kits of parts to build our PCBs is now available: kits contain all parts including machined heatsink coupling plates for the power amplifiers. IMPORTANT NEWS: We are very glad to announce that Douglas Self is now part of the Signal Transfer team. Apart from working on new products, Douglas is available to answer any questions relating directly to Signal Transfer products. He can be contacted at:

High-precision RIAA phono preamplifiers with extremely accurate RIAA equalisation, high overload margin, and very low distortion and noise. Balanced output version available. Both versions are available fully built and tested.

The Precision Preamplifier 2.0 is now available, after a period of development. New features include a high-quality onboard headphone amplifier, an extra line input, and an LED illuminated button facility for all font-panel switches. The pots can now be either ALPS 16mm or Ohmeg Green Eco-pots. The PCB now has gold-flashed pads and is fully RoHS compliant. The Precision Preamplifier is available as a bare PCB, as a kit, or fully built and tested.