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http://www.karltone.co.uk/pre-amp-9-c.asp
If your set of Groove Tubes as a brand, then these guys appear to stock
http://www.stringsdirect.co.uk/search/groove-tubes
soundcloud.com/thecolourbox-1
youtube.com/@TheColourboxMusic
'Valve preamps' rather than 'preamp valves,' although they will no doubt need re-valving!
soundcloud.com/thecolourbox-1
youtube.com/@TheColourboxMusic