633 Engineering Ruby Plus
![Dave Arrowsmith's 633 Engineering Ruby Plus](https://davearrowgtr.com/wp-content/uploads/2020/07/633_ruby_plus.jpg)
Guitar amplifiers are strange and wonderful things: strange because guitarists are almost universally attached to valves and associated technology which have long been outdated in most other electronic fields; wonderful because while the fundamental technology hasn’t changed for decades, refinements are still being made by designers obsessed with electric guitar tone. One such perfectionist is […]