UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Garrard record player deck identification.

GP49000 · 8th Apr 2013, 9:17 pm

Second-generation Reverse Unimech models

The Model 640S was the Reverse Unimech version of the 630S, with the same tonearm, antiskate and controls, but with the reversed pusher spindle and a side support for the record stack; and no overarm. There was no single-play version, since it would have been no different from the 630SP.

The higher priced end of the Unimech series had a new Reverse Unimech Model 775, replacing the earlier 770. Unlike the cheaper Unimechs, this one did not carry over its basic tonearm pivot and pressure-setting mechanism from the prior model. Instead, it had a movable counterweight on a screw thread, with adjustable calibrated collar for setting tracking weight once the tonearm had been set to zero balance, replacing the more complex and more expensive downward-pulling spring for setting tracking weight. It also incorporated an improvement to the horizontal-motion tonearm bearing that substantially reduced friction if properly assembled and adjusted, and which was previously introduced as a change in some upscale Unimech models (it has been found in the 770). Details about this refinement will follow.

640S. Tonearm identical to 630S. Only changes are the side support for the record stack, a different multiple-play spindle, and the associated mechanical changes underneath.

640S in a badge-engineered plinth branded for Monteverdi, the high-priced line of Lloyd's.

775.

775 side view

775 tonearm, antiskate detail

8th Apr 2013, 9:17 pm	#106
GP49000 Hexode Join Date: Mar 2012 Location: Sonoma County, California, USA. Posts: 405	Re: Garrard record player deck identification. Second-generation Reverse Unimech models The Model 640S was the Reverse Unimech version of the 630S, with the same tonearm, antiskate and controls, but with the reversed pusher spindle and a side support for the record stack; and no overarm. There was no single-play version, since it would have been no different from the 630SP. The higher priced end of the Unimech series had a new Reverse Unimech Model 775, replacing the earlier 770. Unlike the cheaper Unimechs, this one did not carry over its basic tonearm pivot and pressure-setting mechanism from the prior model. Instead, it had a movable counterweight on a screw thread, with adjustable calibrated collar for setting tracking weight once the tonearm had been set to zero balance, replacing the more complex and more expensive downward-pulling spring for setting tracking weight. It also incorporated an improvement to the horizontal-motion tonearm bearing that substantially reduced friction if properly assembled and adjusted, and which was previously introduced as a change in some upscale Unimech models (it has been found in the 770). Details about this refinement will follow. 640S. Tonearm identical to 630S. Only changes are the side support for the record stack, a different multiple-play spindle, and the associated mechanical changes underneath. 640S in a badge-engineered plinth branded for Monteverdi, the high-priced line of Lloyd's. 775. 775 side view 775 tonearm, antiskate detail Attached Thumbnails Last edited by GP49000; 8th Apr 2013 at 9:26 pm.