http://www.guitarampmodeling.com/viewtopic.php?f=22&t=16237

Here's another link with a couple of theories about what he may have used to obtain his sound back in the Hawkwind days amp-wise. However, I remember asking him a similar question back in 1984 and he said he used the same heads he'd used in Hawkwind, stolen back from Hawkwind just after he'd been fired from them in front of the hopping-mad 'drum empire'! He then painted over them in matt black and gave a Sounds interview to Geoff Barton, announcing, in a steal from Dr. Hook, 'If this band moved in next door to you, your lawn would die'. I believe Motorhead have been far more effective than weedkiller ever since...