Laboratory Series Stereo Cartridge
- United States of America (USA)
- Manufacturer / Brand
- Grado Laboratories Inc.; Brooklyn (NY)
- Microphone or Pick-up element
- Radiomuseum.org ID
- Wave bands
- - without
- Power type and voltage
- No Power needed
- - For headphones or amp.
- from Radiomuseum.org
- Model: Laboratory Series Stereo Cartridge - Grado Laboratories Inc.;
First stereo moving coil cartridge.
Frequency Response: 10-30,000 Hz +/- 1 dB
Output: 9 mV per channel @ 10 CMV
Impedance: 1100 Ohms per channel
Tracking Force: 3 grams
Stylus Mass: 0.3 milligram
Channel Separation: 30 dB
Diamond Stylus: 33.333 rpm / 78 rpm available.
No magnetic attraction: May be used on steel turntables
Grado 1st generation stereo moving coil cartridges were replaced in 1964 by Grado Tracer-Beam cartridges. Grado patent 3040136 filed Jan 1959 for first moving coil cartridge issued June 19, 1962. This patent shows their mono moving coil cartridge, but principal also applied to stereo.
- Price in first year of sale
- 49.50 USD
- Mentioned in
- 1962-Apr- HIGH FIDELITY page 52
- Literature/Schematics (1)
- 1962 Grado Catalog
- Literature/Schematics (2)
- Patent (3040136)
- Model page created by Matt Endicott. See "Data change" for further contributors.
- Other Models
Here you find 10 models, 6 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Grado Laboratories Inc.; Brooklyn (NY)