Members vrm Posted February 27, 2009 Members Share Posted February 27, 2009 The thread concerning running multiple amps got me thinking, on the 5150 does engaging the crunch button on the rhythm channel engage another tube gain stage? The reason I ask is recently in the studio I was running my 5150 and my ampeg vl-502 together and on the clean channel the amps are in phase, but when I switch over to the lead channel on both amps they are out of phase. Can anyone provide me the info on the gain stages of the 5150 as far as rhythm (clean), rhythm (crunch engaged) and lead channel? Link to comment Share on other sites More sharing options...
Members OverDriven Posted February 27, 2009 Members Share Posted February 27, 2009 Every time the signal hits a gain stage, it flips the phase. So it needs to hit 2 gain stages to be reverted back to the original phase. And yes, the crunch button adds a stage. Link to comment Share on other sites More sharing options...
Members vrm Posted February 27, 2009 Author Members Share Posted February 27, 2009 Thanks O'Driven! I figured as much, then I take it going to the lead channel adds another still? Link to comment Share on other sites More sharing options...
Members knucklefux Posted February 27, 2009 Members Share Posted February 27, 2009 this is a 5150, not a 5150II? looking at the schematic, it appears that all gain stages are engaged at all times...maybe i missed something:idk: Link to comment Share on other sites More sharing options...
Members vrm Posted February 27, 2009 Author Members Share Posted February 27, 2009 this is a 5150, not a 5150II?looking at the schematic, it appears that all gain stages are engaged at all times...maybe i missed something:idk: yeah, just a plain jane 5150. What would cause the clean to be in phase and the lead to be out if all gain stages are engaged? Link to comment Share on other sites More sharing options...
Members DirtyBird Posted February 27, 2009 Members Share Posted February 27, 2009 this is a 5150, not a 5150II?looking at the schematic, it appears that all gain stages are engaged at all times...maybe i missed something:idk: This is what I have always heard also. Link to comment Share on other sites More sharing options...
Members knucklefux Posted February 27, 2009 Members Share Posted February 27, 2009 all i can come up with is that the second stage has a relay that feeds an out of phase signal to the input of the third stage. initially, i supposed that this was just a way to reduce the size of the signal on the grid of the third gain stage. that doesn't explain the phase inversion, though. when that relay is off, that out of phase signal is no longer applied to the third stage's grid. PM jerryP. he's the expert on these things, maybe he can tell you something that makes sense:idk: Link to comment Share on other sites More sharing options...
Members metalfanat1c Posted February 27, 2009 Members Share Posted February 27, 2009 this is a 5150, not a 5150II?looking at the schematic, it appears that all gain stages are engaged at all times...maybe i missed something:idk: That would explain why the clean channel sucks so bad. Link to comment Share on other sites More sharing options...
Members knucklefux Posted February 27, 2009 Members Share Posted February 27, 2009 yeah, the 5150 is the only amp in existence (that i know of) that has a clean channel that uses 6 gain stages. my OD channel only has 4:lol: Link to comment Share on other sites More sharing options...
Members vrm Posted February 27, 2009 Author Members Share Posted February 27, 2009 Thanks guys! I take it them that my ampeg must have 4 stages for clean and 5 for lead causing the phase reversal when the lead is engaged or something like that. Link to comment Share on other sites More sharing options...
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