Lyndon Laney was Toni Iommi's friend.
He actually played in a band with him, pre Sabbath.
Some of his first amps were built specifically for him ...with distortion as a design goal....thus metal tone....intended.
He also put that rangemaster circuit in a Laney...for him. The KLIPP circuit.
Toni has always credited Laney for his sound.
Lyndon never gets the respect that many others do....his work and innovation made players sound better... therefore they played better.
Not sure if this was known or not.