| Brand | Hammond |
|---|---|
| Exact Year | 1960 |
| Model | ER-20 |
| Country/Region of Manufacture | United States |
Check the listing for details. Vintage Hammond Spring Reverb Unit Assembly ER-20. Listed at 195.00 USD. The unit is about 3 feet tall and consists of a network of 5 coil springs, roughly two and a half feet long. The first spring is entirely in air, and the last spring is mostly in air, but a small portion of one end is likewise enclosed in a shortoil-filled tube.