dub Posted February 8, 2016 Share Posted February 8, 2016 Hi There I am looking for a replacement valve for the SWR STUDIO 220. A valve that will give good low end response and a subtly saturated sound when the gain is set quite high would be ideal. The obvious choice is a groove tubes valve, as the preamp was built on a grooves tubes design, but even there there are a few choices. Any suggestions and descriptions of tone would be really helpful. Quote Link to comment Share on other sites More sharing options...
geoffbyrne Posted February 13, 2016 Share Posted February 13, 2016 Post #7 here: http://basschat.co.uk/topic/278695-12ax7-pre-amp-valves/ G. Quote Link to comment Share on other sites More sharing options...
BassBod Posted February 19, 2016 Share Posted February 19, 2016 You won't notice much difference - Groove Tubes were neighbours to the original SWR factory, and branded valves rather than manufactured. I suspect reliable supply (and reliable specs) were most important. Any modern 12ax7/Ecc83 should sound fine. Quote Link to comment Share on other sites More sharing options...
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