dmccombe7 Posted May 28, 2015 Share Posted May 28, 2015 (edited) I've bought a 2nd hand 2003 Ampeg SVT4 Pro and don't know how old the tubes are. Was thinking of changing them to make sure i'm getting the best out of the amp. I know the 1st tube is a Groove Tube 12ax7 but can't find anywhere that tells me what make the other 2 12ax7 are. 1. Can anyone help clarify. ? 2. Where is best place to get replacements ? 3. Are there any tubes you would recommend other than originals and why ? Any help appreciated. Dave Edited May 28, 2015 by dmccombe7 Quote Link to comment Share on other sites More sharing options...
ahpook Posted May 28, 2015 Share Posted May 28, 2015 All three are 12ax7 valves. I've always had great service from Watford Valves - worth dropping them an email. Quote Link to comment Share on other sites More sharing options...
dmccombe7 Posted May 28, 2015 Author Share Posted May 28, 2015 sorry Ahpook didn't word that clearly Should have asked what manufacturer the other 2 12ax7 tubes are. I'm pretty sure i read somwhere they were EH types Dave Quote Link to comment Share on other sites More sharing options...
Muppet Posted May 28, 2015 Share Posted May 28, 2015 Are you sure the ones in it now are the originals? All three originally were Groove Tubes. I swapped mine out but I can't remember what for. I asked t eguys at Watford Valves and they recommended some for me. Quote Link to comment Share on other sites More sharing options...
ahpook Posted May 29, 2015 Share Posted May 29, 2015 (edited) [quote name='dmccombe7' timestamp='1432843851' post='2785603'] sorry Ahpook didn't word that clearly Should have asked what manufacturer the other 2 12ax7 tubes are. I'm pretty sure i read somwhere they were EH types Dave [/quote] Aaah, don't know - can't speak from experience - my two Ampeg preamps have both had a mixture of valves in them, some no-name, some EHX, some Groove Tubes, which suggests to me that they've been revalved in the past Edited May 29, 2015 by ahpook Quote Link to comment Share on other sites More sharing options...
dmccombe7 Posted May 29, 2015 Author Share Posted May 29, 2015 i wasn't sure if it made a difference or not and wanted to keep the amp as original. If all GT types that should make it easier. I'll look at Watford valves and see what they recommend tho Thanks for feedback guys Dave Quote Link to comment Share on other sites More sharing options...
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