The guitar sound of the first Black Sabbath Album is actually the result of a number of key components, Tony himself not withstanding, but it is also the sound of the LA100BL plus a Dallas Arbiter Range master pedal that Tony used at the time, allowing him to push the front end of the amp into overdrive giving him his signature distorted tone never before heard. There is a story relating to Tony and his “Range Master”. In the days immediately before Sabbath, Tony was playing with a band located in Cumbria and a guitar player in a local band said that he could modify Tony’s Range Master and that it would sound better. So Tony agreed and had his pedal modified. Tony never knew what the modification was but it sounded really good and gave his LA100BL the gain he was looking for. The modified Range master was used for recording and touring up until 1979. When, for some reason unknown to everyone apart from Tony’s amp tech at the time - it.
