• Country
• United States of America (USA)

• Manufacturer / Brand
• Conrad-Johnson Design, Inc.; Fairfax & McLean (VA)

• Year
• 1986

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 336080

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

• Number of Tubes
• 5

• Valves / Tubes
• 12AX7 12AX7 12AT7 12AX7 12AT7

• Number of Transistors
• 4

• Semiconductors

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 108-125 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Vacuum Tube Preamplifier PV7 - Conrad-Johnson Design, Inc.;

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 14.5 x 3.75 x 10 inch / 368 x 95 x 254 mm

• Notes

• The power supply is stabilized with three transistors and one FET.
  Also the tubes are powered with a separate stabilized DC circuit.

• Net weight (2.2 lb = 1 kg)
• 12.25 lb (12 lb 4 oz) / 5.562 kg

• Mentioned in
• -- Original-techn. papers. (Introduced in August 1986)

• Literature/Schematics (1)
• -- Schematic ("Il Fascino delle Valvole" Italy, Edifai editor, January 1997.)

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 17 models, 16 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Conrad-Johnson Design, Inc.; Fairfax & McLean (VA)