-> That's pure Univibe through Marshall, as I understand it.
-> I think he also used the vibe to hit the Marshall a little harder.
Back then, he had a custom preamp unit in a box.   I remember he
said a friend of his built it.
Funny how this stuff sticks with us through the years...I can't remember
what I had for lunch, but I can remember Trower's "secret box".
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