Schaller GrandTune Guitar Tuning Machine
The Schaller GrandTune combines vintage styling with modern precision engineering. Built with an open-gear architecture and a classic worm gear mechanism, this tuning machine delivers smooth operation and dependable tuning stability for acoustic and electric guitars.
Featuring an 18:1 gear ratio, it ensures fine-tuning accuracy without unwanted slippage or backlash. The non-coated contact surfaces and precision fit optimize acoustic resonance, while permanently locked and sealed screw connections provide long-lasting, maintenance-free performance.
Designed to fit standard production headstock dimensions, the GrandTune includes recessed screw holes for secure mounting and efficient sound transmission across the instrument.
| Brand | Schaller |
| Model | GrandTune (GT-Single) |
| Gear Ratio | 1:18 |
| Weight per Unit | 0.04 lb (Koa), 0.04 lb (Perloid), 0.04 lb (Galalith, Ebony), 0.05 lb (Snakewood), 0.06 lb (Butterbean) including bushing |
| Button Dimensions (W x H x D) | 0.8 x 0.5 x 0.4 in (Butterbean), 0.7 x 0.5 x 0.2 in (all other buttons) |
| Mounting Screws Included | 2 x M2.2 x 11 mm recessed screws |
| Included Bushing | Hexagonal press-in bushing (0.35 in outer diameter, 0.24 in inner diameter) |



















