Members ChitownTerror Posted February 8, 2007 Members Share Posted February 8, 2007 Does anyone have a tube chart that tells you what pre-amp tubes are what? I'm starting to get some microphonics, and I think the pre-amp tube closest to the power tubes is starting to go. Anyone know what's what on these? I'm heading out to pick up new power tubes today so I might as well pick up some pre's while I'm at it. Link to comment Share on other sites More sharing options...
Members Mad Max Posted February 8, 2007 Members Share Posted February 8, 2007 Link to comment Share on other sites More sharing options...
Members inscho Posted February 8, 2007 Members Share Posted February 8, 2007 the phase inverter is the one nearest the power tubes Link to comment Share on other sites More sharing options...
Members ChitownTerror Posted February 8, 2007 Author Members Share Posted February 8, 2007 the phase inverter is the one nearest the power tubesSo, it probably wouldn't be the bad apple, then, would it? I noticed it because it was glowing incredibly brightly (like power tubes before they eat it), but maybe it's one of the other 7025's that's causing the microphonics?I wish I knew more about electronics and amplifiers. Link to comment Share on other sites More sharing options...
Members inscho Posted February 8, 2007 Members Share Posted February 8, 2007 So, it probably wouldn't be the bad apple, then, would it? I noticed it because it was glowing incredibly brightly (like power tubes before they eat it), but maybe it's one of the other 7025's that's causing the microphonics? I wish I knew more about electronics and amplifiers. if its microphonic just turn the amp on, but leave it unplugged and lightly tap each tube with something hard/metal, i use a pencil most the time. Link to comment Share on other sites More sharing options...
Members ChitownTerror Posted February 8, 2007 Author Members Share Posted February 8, 2007 if its microphonic just turn the amp on, but leave it unplugged and lightly tap each tube with something hard/metal, i use a pencil most the time. So, you tap it with the part around the eraser? Link to comment Share on other sites More sharing options...
Members inscho Posted February 8, 2007 Members Share Posted February 8, 2007 So, you tap it with the part around the eraser? i don't think it really matters, but yes. you'll hear the thumping through the speakers if its microphonic. Link to comment Share on other sites More sharing options...
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