Ya que se hablado de Kossoff..... Esto habla de su equipo
https://www.groundguitar.com/paul-kossoff-guitars-and-gear/
No es el único sitio que cita un Selmer Treble and Bass como el ampli con que se pudo grabar All right now.
Un estracto del enlace
" In the early days of Free Paul seemed to have used a 1967 Marshall JTM45/100s (mostly known just as JTM100) – as seen on the photos from the booklet of “Tons of Sobs” album. The amp is easily recognizable by the reverse JTM block logo, which is the reason why it’s also known as the “Black Flag”. He played the amp through a cabinet that he allegedly built with his father sometime during the Black Cat Bones era.
When Free went on their first tour Paul started using Marshall Super Lead 100w 1959 played through Marshall cabinets equipped with G12H speakers. Later on he mostly used Marshall Super PAs (as seen during the Isle of Wight gig in 1970), but he was also seen using Super Bass heads.
Also worth noting is that he allegedly used a Selmer Treble and Bass Fifty on the band’s biggest hit “All Right Now” from the third album. If so, that amp probably pre-dates his first Marshall, and it is somewhat safe to believe that Paul bought it while working at Selmer’s music shop in late 60s.
Other amps that he used include a Fender Super Reverb combo that was mostly seen just on some photos taken during studio sessions of the early albums, and an Orange amp that he used on a gig played during a show called “Beat Club” which aired on German television."