Micro Control

Constructed of the finest gunstock walnut wood and hand rubbed to bring out the natural beauty of the wood grain. The metal fittings are of finely machined anodized aluminium.
The tonearm has four separate leads and a shielded cable and may be used for monaural or stereo playback.
Tracking error: ±0.8°
Resonance: 10cps approximately +3dB
Micrometer overhang adjustment: ±¼"
Height adjustment: ±1¼" 
Stylus force adjustment: ±7g (Mean adjustment: 6g froce for a 12g cartridge)
Arm length: lateral pivot to stylus centers 8⅞"
Offset angle: 24.5°
Pivot frictions: under 0.1g at stylus
Weight:
12" version: 709g
16" version: 794g
Price:
12" version: $29.95
16" version: $32.50

In questo link sono elencati 10 modelli, di cui 6 con immagini e 2 con schemi.
Elenco delle radio e altri apparecchi della Grado Laboratories Inc.; Brooklyn (NY)