tag:blogger.com,1999:blog-6847048658257278783.post8885905693410119836..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Fulltone 69IvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger63125tag:blogger.com,1999:blog-6847048658257278783.post-11405625643414701012021-11-11T13:14:07.936+00:002021-11-11T13:14:07.936+00:00Anyone there ?Anyone there ?jonizefoxhttps://www.blogger.com/profile/13545567509902223028noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71430149578935676492021-11-07T14:39:37.656+00:002021-11-07T14:39:37.656+00:00mounted with 2 Mullard AC128 83 / 123 HFe. Couldn&...mounted with 2 Mullard AC128 83 / 123 HFe. Couldn't get less than -4.7V at Q2 collector, but it works.<br />Contour know works weird : big loss of volume when turned full clockwise, and full full volume when full counterclockwise. Any thought about that ?<br />BIAS = "Input bias" as named on MKII Fulltone pedal I guess. jonizefoxhttps://www.blogger.com/profile/13545567509902223028noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77101438693251331162021-11-07T14:35:00.942+00:002021-11-07T14:35:00.942+00:00This comment has been removed by the author.jonizefoxhttps://www.blogger.com/profile/13545567509902223028noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-88217180146883848382021-08-19T04:04:34.371+01:002021-08-19T04:04:34.371+01:00I think maybe the bias and contour controls are mi...I think maybe the bias and contour controls are mislabeled. The input cap (2.2u) is connected to a bias control (50k). But that’s a contour control. The contour is the bias (1k) which seems low. Bias on a ff is typically 5-10k. The layout confused me. Think that’s what’s going on. Minor detail I guess.Tomhttps://www.blogger.com/profile/00083508505870725881noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-55836254017976309902021-05-25T21:10:23.112+01:002021-05-25T21:10:23.112+01:00Turn the trimmer until you read -4.5V at the Colle...Turn the trimmer until you read -4.5V at the Collector of Q2, not the middle leg.Cochoishttps://www.blogger.com/profile/06508688482896325016noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-61264591746332575502021-02-10T10:30:59.339+00:002021-02-10T10:30:59.339+00:00hey guys, thanks for this great website and all th...hey guys, thanks for this great website and all the contributors.<br /><br />This is my first Vero build and I have it all wired up except the footswitch. I am getting sound through it but its very quiet. I have set the trimmer to 4.5v but the middle leg of Q2 is reading -2.0v and the middle leg of Q1 is reading -0.15v. <br />Do you think this is a problem with the transistors? Is there something else I haven't considered?<br />ThanksMatthttps://www.blogger.com/profile/01319190669763316512noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-83635518923782998792017-05-03T16:22:11.056+01:002017-05-03T16:22:11.056+01:00I have a Fulltone 69 pedal in my pedal chain. Inte...I have a Fulltone 69 pedal in my pedal chain. Intermitently the volume will drop. Using PedalPower to supply power to it. I contacted Fulltone and they asked me if the problem happens with a battery which I tried and it seemed to remedy the problem. Is there a way to get it to work with no volume drop and the PedalPower ?Anonymoushttps://www.blogger.com/profile/01722919940250632189noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77030437275618175082017-04-21T11:13:35.567+01:002017-04-21T11:13:35.567+01:00I just built this with two AC128, and man... this ...I just built this with two AC128, and man... this is the best vintage sounding fuzz I have ever built. Very good!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37617264505159317972017-04-12T09:11:07.228+01:002017-04-12T09:11:07.228+01:00Built this recently with a matched pair of SFT307 ...Built this recently with a matched pair of SFT307 GE transistors, really nice. Thanks for the layout!Chancehttps://www.blogger.com/profile/03508039283950531588noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-66327503141809713792015-05-26T06:41:40.730+01:002015-05-26T06:41:40.730+01:00The footswitch is the same for any effect, the LED...The footswitch is the same for any effect, the LED will be a bit different, though. Solder the positive leg of the LED to your standard spot on the 3PDT footswitch and solder the negative leg (with a resistor in series to it) to the "-9V" power lug on the 9V jack. So, pretty much like a NPN fuzz, just reverse the LED's legs. Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71288178220164219172015-01-07T10:42:07.512+00:002015-01-07T10:42:07.512+00:00Is it possible to show exactly how I have to solde...Is it possible to show exactly how I have to solder the footswitch and the LED because of the positive ground?<br /><br />Thank you.Andy1973https://www.blogger.com/profile/03596560092717793212noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67932640646926113652014-12-14T20:19:45.981+00:002014-12-14T20:19:45.981+00:00Excellent! Glad I could help :PExcellent! Glad I could help :PTravishttps://www.blogger.com/profile/00836791717229314419noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-74715611942197165662014-12-14T12:00:15.373+00:002014-12-14T12:00:15.373+00:00Thank you !!!
I get back tell you my "experie...Thank you !!!<br />I get back tell you my "experience" :-)<br />I tested different values, like suggested by Travis, 470, 820 and 1k<br />Output level is much better than original (220 Ohms)<br />Sound is not affected<br />For now, I have kept the 1k value, but it's just slighty too high ...<br />I probably unsolded this one to replace it by the 820, the value I will keep !<br /><br />Thanks you again, sounds great !!!!<br />S.sylvainhttps://www.blogger.com/profile/12226697199666677227noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-79940143943287198162014-11-12T18:18:50.165+00:002014-11-12T18:18:50.165+00:00This comment has been removed by the author.shabeasthttps://www.blogger.com/profile/10305688768769255570noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-12957735502377307992014-10-30T04:44:22.097+00:002014-10-30T04:44:22.097+00:00Problem is solved. I was checking voltages again a...Problem is solved. I was checking voltages again and I think I just hit something with the tip of the DMM's test lead and the trimpot came to life (?) All of sudden Q2's collector was reading 3V. After a little more testing I decided to tune it up by ear, leaving it by the 5V or so range. Still sounds wonderful. I think I'm retiring my old silicon FF, LOL! Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-63532609942691023822014-10-29T17:54:23.646+00:002014-10-29T17:54:23.646+00:00Could anyone who has bulit this circuit post volta...Could anyone who has bulit this circuit post voltage readings of both transistors for me? The readings of an original '69 Fuzz would work, too.<br /> <br />My pedal works and sounds awesome to my ears. All controls work as they should, based on what I can tell from demos. I was just wondering why I can't bias Q2 collector to anything less than 7V. I tried 4 different transistors there and even with the trimmer all the way down I cannot get it down to 4.5V (supposing the stock/recommended voltage reading should be this - like a regular FF). <br /><br />By the way, should the "contour" control interfere with that voltage? Mine works, that is, I get dying batery sounds when I back it off, but as measure Q2 while fiddling with it, I see no changes in voltage reading. Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-89069239201727925162014-10-27T13:35:37.592+00:002014-10-27T13:35:37.592+00:00Yeahhh ! Thanks Travis !
I will try this !
Increas...Yeahhh ! Thanks Travis !<br />I will try this !<br />Increasing the output resistor to obtain correct output level, without increasing the hummmm !<br />Thanks a lot<br />A nice couple of "high gain" transistors + better output vol, I would be thrill !!!<br />Cheers<br />S.sylvainhttps://www.blogger.com/profile/12226697199666677227noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51846497596532999902014-10-27T13:24:34.422+00:002014-10-27T13:24:34.422+00:00Hey. That's normal for this circuit to not be ...Hey. That's normal for this circuit to not be very loud.<br /><br />You can increase the output by increasing the value of the 220Ω resistor<br /><br />Try 470Ω, 820Ω, 1Κ<br /><br />Beware that if you increase it too much you will introduce a lot of excess noise, so increase the value gradually and stop when you have just enough outputTravishttps://www.blogger.com/profile/00836791717229314419noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67097825088933498432014-10-27T10:30:59.381+00:002014-10-27T10:30:59.381+00:00Hello From France Mark,
Built this one this WE an...Hello From France Mark,<br /><br />Built this one this WE and it sounds great !!! Cool vintage tone !<br />I just planed to change the 2 transistors for a "High Gain" pair, selected by BanzaiMusic ;-)<br />Mine are around 80 for Q1 and 110 for Q2 and I have a "moderate" gain for a fuzz<br />thank for your awesome website !<br />A question : the output level is low ...<br />In all the demos I've seen, "volume" button is at maximum, all over the time !!!<br />Is there a way to increase it please ?<br />(others builders have they found the same thing please ?)<br /><br />Thanks a lot Mark, have a good day<br />S.sylvainhttps://www.blogger.com/profile/12226697199666677227noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47553305111639514772014-08-23T04:32:56.777+01:002014-08-23T04:32:56.777+01:00Built this one today and it sounds pretty good. I&...Built this one today and it sounds pretty good. I'm using AC125's Q1: 85hfe and Q2: ~120hfe. Quite good amount of gain - I can play it through a totally clean amp and the fuzz doesn't sound weak or thin. <br /><br />I'm still kind of getting used to whether I really like the bias and contour controls LOL. Need to get this boxed and play more with it. Thx, Mark! Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-65575360624268681302014-04-22T02:21:07.942+01:002014-04-22T02:21:07.942+01:00Better is subjective. I bet they are the same circ...Better is subjective. I bet they are the same circuits, the differences would be there because of tolerances and the inherent characteristics of the transistors used. You could probably grab another "slight return" version of the same pedal and think it doesn't sound as good as the first one you tried or heard. Iagohttps://www.blogger.com/profile/13478141026000247956noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-51680624369486835552014-03-14T20:55:31.533+00:002014-03-14T20:55:31.533+00:00I found part of the problem: I had the board and b...I found part of the problem: I had the board and battery -9v switched (no more building after 01:00 :P ). Re-soldered and now it works with the DC in. <br /><br />The LED still lights up when the pedal is engaged with no cables going to the input... the LED also faintly lights up when the - leg is touched. Is that normal?<br /><br />Anyway, i think i'll leave it for now. <br /><br />Oh, and I've removed the battery clip, it was too tight of a fit anyway. No battery mojo for me i guess.<br /><br />Some pics (nothing fancy): <br /><br />http://www.flickr.com/photos/dannyvandam/13154069975/in/set-72157642356692863/<br /><br />http://www.flickr.com/photos/dannyvandam/13154354474/in/set-72157642356692863/DvDamhttps://www.blogger.com/profile/09019094653666270708noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-54931832768578179662014-03-14T18:06:02.725+00:002014-03-14T18:06:02.725+00:00what's the difference between this one and the...what's the difference between this one and the Slight Return version? Slight Return sounds much better i think, but i cant find any schematics of that one on the net :(Meekhttps://www.blogger.com/profile/15435197202468367637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8189049461293839472014-03-14T16:37:57.091+00:002014-03-14T16:37:57.091+00:00I used the offboard wiring that is listed on here ...I used the offboard wiring that is listed on here and adjusted for battery use. I will take some pics when i get home, makes it easier right? Thanks!DvDamhttps://www.blogger.com/profile/09019094653666270708noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-8374554254025175312014-03-14T16:16:50.162+00:002014-03-14T16:16:50.162+00:00What wiring scheme did you use for the offboard?What wiring scheme did you use for the offboard?IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.com