tag:blogger.com,1999:blog-6847048658257278783.post1114055907708207206..comments2024-03-28T18:53:30.726+00:00Comments on Guitar FX Layouts: Tubeworks Real Tube 903 Modded Tone StacksIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger93125tag:blogger.com,1999:blog-6847048658257278783.post-73020802606936831672019-03-20T23:08:29.993+00:002019-03-20T23:08:29.993+00:00Hello, did you get your svt working and if so what...Hello, did you get your svt working and if so what changes did you have to make? Thanks Anonymoushttps://www.blogger.com/profile/15828893343109077682noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-38399563604609100342019-03-20T00:49:36.920+00:002019-03-20T00:49:36.920+00:00No answer yet, thanks.No answer yet, thanks.Anonymoushttps://www.blogger.com/profile/15828893343109077682noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57359830597189983662019-02-23T12:47:58.603+00:002019-02-23T12:47:58.603+00:00Please anyone can you verify if this works? Please anyone can you verify if this works? Anonymoushttps://www.blogger.com/profile/15828893343109077682noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-63690036856556654642019-02-21T17:34:14.471+00:002019-02-21T17:34:14.471+00:00Does anyone know if the SVT has been verified? Tha...Does anyone know if the SVT has been verified? Thank youAnonymoushttps://www.blogger.com/profile/15828893343109077682noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81497297347718049932018-12-23T13:40:55.796+00:002018-12-23T13:40:55.796+00:00"Current Limiter Resistor" Is used to li..."Current Limiter Resistor" Is used to limit the current on the LED. The value depends on LED used. Check this link for how to calculate the value: http://www.resistorguide.com/resistor-for-led/Moerbiushttps://www.blogger.com/profile/18011103440450510590noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-42759898809984291742018-11-16T11:01:13.407+00:002018-11-16T11:01:13.407+00:00Hello, in all Layouts there's a resistor in th...Hello, in all Layouts there's a resistor in the power supply section with "CLR" on it. Which would be the right value? Thank you!Anonymoushttps://www.blogger.com/profile/04326289837452443862noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9045142658144514042018-07-14T01:20:13.487+01:002018-07-14T01:20:13.487+01:00I built the Sunn version have same problems as Zol...I built the Sunn version have same problems as Zoltan.I started back probing it with my audio probe.the problem i have is comming out of pin 1.I have clean signal going into pin 3 but pin 1&2 are hardly passing any audio.It sounds like a Jfet that is misbiased.glasspak73https://www.blogger.com/profile/11792030395861982394noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-84778479378163341852018-03-27T01:35:46.919+01:002018-03-27T01:35:46.919+01:00Hi guys! I built the ‘72 SVT version with no luck....Hi guys! I built the ‘72 SVT version with no luck. I have the same result, the lt1054 burns up right away, I changed the supply to work with a 7660s and it seems to be working somehow, but it’s still not good. The tube glows as it should and signal passes through it but the low control cuts the signal when it’s maxed, and the drive works in reverse, the high and volume controls doesn’t do nothing (maybe the volume cuts the signal too) and it has really really low volume, it’s just slightly noticeable that the thing is on. I can’t imagine why does it burn the LT’ s, because I tried them in another pedal before installing and they worked fine.Zoltanhttps://www.blogger.com/profile/13432953610744887630noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83063063525043116672017-12-14T12:37:30.624+00:002017-12-14T12:37:30.624+00:00I build the 90's Dumble and fiddled around wit...I build the 90's Dumble and fiddled around with it. But with no luck.<br /><br />Same problems as some people already reported. LT1054 burns up right away and the 7660 only gives a oscillation noise. <br /><br />I socketed some stuff, so i could check some areas. like what Kevinrontel wrote and myself, but it didn't work. Still only oscillation.<br /><br />The noise does go away if i remove the tube, if that is any help :) Anonymoushttps://www.blogger.com/profile/08394467292419542457noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-44851153655022975332017-11-27T02:51:17.109+00:002017-11-27T02:51:17.109+00:00I just got the Vox version working. My only chang...I just got the Vox version working. My only change to the layout was to move the negative leg of the 22K resistor to Ground rather than A-. <br /><br />At first, I couldn't get the tube to function, but then I tested my voltages on A- and A+ coming from the power supply. A- was at -12V and A+ was at 11.88V. <br /><br />I know virtually nothing about tube biasing, and I know even less about dual power supplies. Still, I figured that, in order for the ol' electrons to move the right way thru the tube, I ought to get the A- lower than the A+. <br /><br />I wired a 5K trimpot on A- coming out of the power supply and fiddled with it until, ahoy, the thing started working.kevinrontelhttps://www.blogger.com/profile/16952529612656836649noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48700769800558312252017-11-24T20:53:40.452+00:002017-11-24T20:53:40.452+00:00For those of you having trouble with the Dumble la...For those of you having trouble with the Dumble layouts, here's a possible solution: Try moving the negative side of the 22K resistor to the ground row, not the A- row. kevinrontelhttps://www.blogger.com/profile/16952529612656836649noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8639296238976814592017-11-05T15:13:34.106+00:002017-11-05T15:13:34.106+00:00Hey guys,
I see it's still not verified yet. ...Hey guys,<br /><br />I see it's still not verified yet. I would love to build one of these :)<br /><br />But i got a couple questions. When i follow the schematic on revolutiondeux, i found a couple things that don't make sense to me. (i'm looking at the Dumble 90's layout)<br /><br />1. The 1k on top of the layout, going into the 2.2uf.<br /> The schematic says 22uf and a 1m to ground. Does it have any effect that the 1m is removed and the cap is smaller?<br /><br />2. the 47nf after IC pin 7, it first goes into a 100k and then into 2 10k's. <br />But why the 100k? Is this to reduce noise?<br /><br />3. the 22k from A- going to 22uf/1k after IC pin 1.<br />I can't see it in the schematic. <br /><br />4. Tube pin 8 and 3. Going into a 2k2 to A-.<br />But does it make contact with Tube pin 7 and 2 via any 10k? Or is this not needed?<br /><br />5. the 2 68k's on Tube Pin 1 and 6.<br />Schematic shows 6.8k but layout uses 68k. Is this because there's different voltages in the pedal?<br /><br /><br />I really appreciate all the work guys :). Hopefully you can spot the error in the layout. I'm not very good at reading schematics or configuring a tube, but maybe i pointed out something usefull...Or maybe i'm just an idiot. Let's hope for the last one ;)Anonymoushttps://www.blogger.com/profile/08394467292419542457noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-22241147197760174622017-10-19T18:20:25.583+01:002017-10-19T18:20:25.583+01:00Its not working yet, no sound when enggage. Tube l...Its not working yet, no sound when enggage. Tube light up and warm, im trying bypass the tone stack but still no soundPeesuthttps://www.blogger.com/profile/02853806973902406635noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52524206815998953832017-10-19T10:38:05.770+01:002017-10-19T10:38:05.770+01:00Have you wired all the 12ax7 pins like this? (just...Have you wired all the 12ax7 pins like this? (just checking ;))<br /><br />(http://www.mif.pg.gda.pl/homepages/frank/sheets/093/1/12AX7.pdfAnonymoushttps://www.blogger.com/profile/08394467292419542457noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40908104212759062042017-10-14T16:43:37.851+01:002017-10-14T16:43:37.851+01:00Jazz 6 is not connected to anything. This wil prob...Jazz 6 is not connected to anything. This wil probably take the 330pf from treble 3 and leave it out of the circuit. That would be my guess.<br /><br />It shouldn't be the reason why you're 70's dumble doesn't work. <br /><br />In the meantime, is the pedal working now? Or are you still searching for an error in the circuit?Anonymoushttps://www.blogger.com/profile/08394467292419542457noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-13312118678399003662017-10-05T14:56:27.320+01:002017-10-05T14:56:27.320+01:00I've built the dumble 70's as well with th...I've built the dumble 70's as well with the same result..did not work. I also built the standard 903 and can't get it to work. I have checked and double checked everything and I can't get any sound to pass through the tube. Any ideas anyone?Anonymoushttps://www.blogger.com/profile/11643207386326747188noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-62669162172926108032017-09-02T08:10:53.883+01:002017-09-02T08:10:53.883+01:00Hi, i've built dumble 70's and didnt work....Hi, i've built dumble 70's and didnt work.<br />I found that jazz 6 connect to nothing. Is that correct?<br />ThanksPeesuthttps://www.blogger.com/profile/02853806973902406635noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52980172098445971242017-08-09T22:21:12.481+01:002017-08-09T22:21:12.481+01:00So the negative lead of that cap is to ground. The...So the negative lead of that cap is to ground. Then check the voltages and the pump. Only way to blow a filter cap is to feed it voltage in reverse.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5366607738709418502017-08-09T16:07:38.642+01:002017-08-09T16:07:38.642+01:00Hey Mirosol, the polarity is the same as given on ...Hey Mirosol, the polarity is the same as given on the the schematics of the Ampeg SVTAnonymoushttps://www.blogger.com/profile/04863933428166887529noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-73673001858222431652017-08-09T12:47:39.439+01:002017-08-09T12:47:39.439+01:00Is your cap reversed? Negative marked lead needs t...Is your cap reversed? Negative marked lead needs to go to ground - if not, then your symptom is expected.<br />+mmirosolhttps://www.blogger.com/profile/02400327798106357876noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-4678922161770249742017-08-09T08:44:52.757+01:002017-08-09T08:44:52.757+01:00I keep blowing the 47uf cap at the chargepump betw...I keep blowing the 47uf cap at the chargepump between A+ and the ground, its rated for 35v. Anyone has an idea why?Anonymoushttps://www.blogger.com/profile/04863933428166887529noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56085370291591351822017-08-03T19:57:17.433+01:002017-08-03T19:57:17.433+01:00That's great news, most likely the other layou...That's great news, most likely the other layouts with the FMV style tonestack are good to go too, so the big question is the dumble, and Bandax style tonestack circuits. Out of curiosity did you do a star ground? That might take away some of the little extra hiss.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88203941302089962062017-08-03T19:21:43.050+01:002017-08-03T19:21:43.050+01:00Okie dokie. The Sunn version (with the above twea...Okie dokie. The Sunn version (with the above tweaks) sounds great. There's some hiss, but it's well within tolerance. To my ears, the tonestack has very distinct bass, mids and treble ranges, with bass and treble skewing more toward the bass and treble ends of the spectrum, respectively, than your typical marshall/fender set up. The power supply using the 7660S chip is meeting all power needs. <br /><br />Zach: Thanks for your assistance. And now, onto the Vox version...kevinrontelhttps://www.blogger.com/profile/16952529612656836649noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-60152589805964635612017-07-27T18:25:16.258+01:002017-07-27T18:25:16.258+01:00This comment has been removed by the author.kevinrontelhttps://www.blogger.com/profile/16952529612656836649noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-70805413430678699322017-07-26T21:18:51.718+01:002017-07-26T21:18:51.718+01:00Hey - I tried rebuilding the fender version again ...Hey - I tried rebuilding the fender version again today with the changed layout, the 7660s, the capacitor to IC 5 on the power board, and the above suggestion that it should be 2&3 joined rather than 1&2 for the drive (I tried it both ways, same result). While it does power on and hold power now, all I'm getting from it is a high pitched wine that fades in with the tube warming up. It seems to be connected to the drive as it disappears when the drive is below midway, but still no sound. I have gone over it a few times tonight and I'm sure there's no shorts or mistakes in the build, but I will double check in the morning when I have a clear headAnonymoushttps://www.blogger.com/profile/12253765180013528394noreply@blogger.com