"....a preamp unit that is for many players a repository of holy grail electric guitar tone.
Among them is Buzz Osborne of the Melvins, who has long incorporated them and Beta Lead heads in his live and studio setups. The PL-20 comes hot on the heels of a slew of product announcements as the brand's return was announced – and facilitated – Fender, who in partnership with Mission Engineering will be manufacturing new Sunn amplifiers and speakers in the USA, and promising options at various different price points."
https://www.musicradar.com/news/sunn-amplification-beta-pl-20-rackmount