The Signetics NE540 was a late 1970's-era Audio Pre-Driver.
The device has long been discontinued and the datasheets available online are not clean copies.
This scan is from the original Signetics 1971 NE540/SE540 data sheet and includes a PC board layout for a 35W power amp.
At that time Signetics was owned by the Corning Glass Works.
NE540/SE540 Data sheet PDF: https://www.proaudiodesignforum.com/ima ... asheet.pdf
Signetics 1971 NE540/SE540 Datasheet.
Signetics NE540/SE540 Data Sheet
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