The amp was so ubiquitous that Marshall used ... It’s worth noting that for an extra $600/£640 (and an extra 9.54kg!) Fender’s all-valve version is available, but you won’t have access ...
Fender equipped amps including the Deluxe Reverb, Twin Reverb, Vibroverb, Tremolux, Pro, and others, with a new tremolo circuit. It used both sides of a dual triode valve and an optocoupler.