Manufacturers:
- P & H Electronics
- Palec Paton Electrical PTY LTD
- Palomar Engineers
- Panasonic
- Panoramic Radio Products
- Parasound
- Parks Electronics Laboratory
- Penlon
- Pentax
- Pfaff
- Phase Linear
- Philco
- Philips
- Philmore Manufacturing
- Picotest Corporation
- Pierson Electronic Corporation
- Pilot Radio and Tube Corporation
- Pioneer
- Plessey Electronics
- Plus Vision Corp.
- Polaroid
- Polytronics
- Power Designs Inc.
- PowerTen
- Präcitronic
- Practical Electronics Sound Design
- Precise Development Corporation
- Precision Apparatus Corporation
- Precision Electronics
- Prema Präzisionselektronik und Messanlagen GmbH
- President
- Programmed Test Sources Inc.
- Protek
- Proview
- Proxxon
- Puxing
- PYE
