• Country
• United States of America (USA)

• Manufacturer / Brand
• Apt Corporation; Cambridge, MA

• Year
• 1979 ?

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 354503

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Audio-Amplification; Hi-Fi-High End products

• Wave bands
• - without

• Details
• Hi-Fi equipment

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - For headphones or amp.

• Material
• Printed Circuit Board

• from Radiomuseum.org
• Model: Pre-preamplifier 201-A - Apt Corporation; Cambridge, MA

• Shape
• Chassis only or for «building in»

• Notes

• Pre-preamplifier for use with Holman Preamplifier.  Model 201-A is specifically for a Denon 103 series cartridge.

• Author
• Model page created by David Erali. See "Data change" for further contributors.

• Other Models

• Here you find 4 models, 4 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Apt Corporation; Cambridge, MA