Members davidM Posted March 11, 2007 Members Share Posted March 11, 2007 Okay, so this thing seems little funky and the manual isn't helping, nor is a google searching. can someone label which preamp does what if I'm facing the amp from behind looking into the panel? tube 1 tube 2 tube 3 tube 4 tube 5 my effects loop has a significant signal drop, and either the amp is f'd or the tube is weak. I bought a new preamp tube to test it out, and if that doesn't work, then it's an MXR Micro Amp for me. thanks guys Link to comment Share on other sites More sharing options...
Members knucklefux Posted March 11, 2007 Members Share Posted March 11, 2007 right to left, v1-v5. v1,2,&3 are gain stages for the two channels, v4 is the effects buffer, and v5 is the phase inverter. Link to comment Share on other sites More sharing options...
Members HKSblade1 Posted March 11, 2007 Members Share Posted March 11, 2007 I think it's V1-V2 gain V5 (in middle), V3-V4 gain stages dont remem if it was the 5150 or 5150II that did so maybe someone else knows. I used to have a layout. maybe I can find it Link to comment Share on other sites More sharing options...
Members apunkrockmonk Posted March 11, 2007 Members Share Posted March 11, 2007 Courtesy of FJA Preamp tube layout Link to comment Share on other sites More sharing options...
Members knucklefux Posted March 11, 2007 Members Share Posted March 11, 2007 yeah, so what i said... Link to comment Share on other sites More sharing options...
Members DirtyBird Posted March 11, 2007 Members Share Posted March 11, 2007 yeah, so what i said... He just reiterated what you said from a reputable source. THere's no need to be offended that a reputable source corroborated your post. Link to comment Share on other sites More sharing options...
Members zoean Posted March 11, 2007 Members Share Posted March 11, 2007 What would be some good tube combos for the 5150. Is it best to run straight 12ax7's across, or a combo of different tubes. Anything specific for for the phase invert? Also, if v1-v3 are the gain stage slots. Which ones are for the lead channel, and which ones are for the crunch channel. Peace -Jeff Link to comment Share on other sites More sharing options...
Members davidM Posted March 11, 2007 Author Members Share Posted March 11, 2007 Courtesy of FJAPreamp tube layout That was just what I was looking for! As for using different tubes, I've heard a lot of people talking about using different tubes for each stage of gain. But I've never tried it.... uncle sam raped me this year. But soon ill get my amp exactly how I want it. Link to comment Share on other sites More sharing options...
Members davidM Posted March 11, 2007 Author Members Share Posted March 11, 2007 Ps, crucify me if you must... but what is a phase inverter Link to comment Share on other sites More sharing options...
Members DirtyBird Posted March 11, 2007 Members Share Posted March 11, 2007 Ps, crucify me if you must... but what is a phase inverter Im no EE, but since no one else has answered, here you go. Class AB amps have pairs of tubes, one tube in each pair does one half of the sine wave, and the other tube does the other half. And by half, I mean top and bottom. Basically the phase inverter just splits your signal up into two different parts and so that the tube pairs can amplify them. Link to comment Share on other sites More sharing options...
Members Shask Posted March 11, 2007 Members Share Posted March 11, 2007 Im no EE, but since no one else has answered, here you go.Class AB amps have pairs of tubes, one tube in each pair does one half of the sine wave, and the other tube does the other half. And by half, I mean top and bottom.Basically the phase inverter just splits your signal up into two different parts and so that the tube pairs can amplify them.Yep, basically. Splits it into the 2 power amp halfs... Link to comment Share on other sites More sharing options...
Members JMP2203 Posted May 7, 2007 Members Share Posted May 7, 2007 i dont undestand the FJA info, which is the PI? V4 or V5? is V3 for effect loop? Link to comment Share on other sites More sharing options...
Members psychodave Posted May 7, 2007 Members Share Posted May 7, 2007 yeah, so what i said... Um, actually not. According to your post you said right to left V1,V2,V3,etc. According to Jerrys webpage it reads right to left: V1,V2,V5,V3,V4. http://www.fjamods.com/5150Models.html Link to comment Share on other sites More sharing options...
Members JMP2203 Posted May 7, 2007 Members Share Posted May 7, 2007 bump Link to comment Share on other sites More sharing options...
Members JerryP Posted May 7, 2007 Members Share Posted May 7, 2007 The phase inverter is the tube closest to the power tubes. Peavey calls that tube V4. The tube next to the phase inverter Peavey calls V3 and that is for the loop.Jerry Link to comment Share on other sites More sharing options...
Members JMP2203 Posted May 7, 2007 Members Share Posted May 7, 2007 The phase inverter is the tube closest to the power tubes. Peavey calls that tube V4. The tube next to the phase inverter Peavey calls V3 and that is for the loop. Jerry thank you very much, and V5? Link to comment Share on other sites More sharing options...
Members davidM Posted May 7, 2007 Author Members Share Posted May 7, 2007 so the picture on the FJA site of the layout listed above is dead on right? i printed the sucker out and hung it on the wall in my practice space Link to comment Share on other sites More sharing options...
Members JerryP Posted May 7, 2007 Members Share Posted May 7, 2007 thank you very much, and V5? Just like in the picture, V5 is in the middle. I have no idea why Peavey labeled them out of order, but that's the way it is. Jerry Link to comment Share on other sites More sharing options...
Members davidM Posted May 7, 2007 Author Members Share Posted May 7, 2007 Jerry your my hero! Link to comment Share on other sites More sharing options...
Members JMP2203 Posted May 7, 2007 Members Share Posted May 7, 2007 Just like in the picture, V5 is in the middle. I have no idea why Peavey labeled them out of order, but that's the way it is.Jerry yeah i knoq that V5 its on the middle, but... what the funcion of that tube? gain stage? thanks Link to comment Share on other sites More sharing options...
Members nwright Posted May 7, 2007 Members Share Posted May 7, 2007 So, from a tonal standpoint, Jerry, could you say that going right to left could be construed as V1-V5 in terms of tonal impact? Meaning the farthest one right has the most tonal effect and then each tube going towards the left has less of a tonal effect, even if technically they aren't labeled V1, V2, V3, etc.? That may not even make sense... Link to comment Share on other sites More sharing options...
Members bryan_kilco Posted June 26, 2020 Members Share Posted June 26, 2020 Sorry to bump such an old thread. Just ordered a kit and slightly confused on the preamp layout still. The tube company I bought from says V5 is the PI tube, yet all the diagrams I see say V4 is the PI. Link to comment Share on other sites More sharing options...
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