I live in Brighton and I'm sure I know the 'old dude' you're talking about. He claims to be an expert in valve amps but he's a liar and a fraud who has damaged amps belonging of many friends of mine. He 'repaired' a 4 way Laney footswitch for me, lied repeatedly about waiting for delivery of some 'heavy duty' switches, eventually installed the cheapest switches available, charged me a fortune and they all cr@pped out within a couple of months. I can't remember his name but if you ever come across an old amp repair guy in Brighton, take no chances - run!!