Regulated power supply for a preamplifier, drawn in a 601 KB PDF schematic with a source tag in the name. Such supplies usually derive a clean split rail from a transformer through rectifiers, filter capacitors and linear regulators, keeping op-amp stages quiet. Exact voltages and parts are not given in the name. Useful when building or repairing a preamp that hums or loses one rail; check regulator ratings, heatsinking and capacitor polarity, and measure outputs before connecting the audio board.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @pdf_servicemanual. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.