tag:blogger.com,1999:blog-6847048658257278783.post1553606075685241966..comments2024-03-29T01:36:12.851+00:00Comments on Guitar FX Layouts: Laney Supergroup 100 MkI PreampIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger53125tag:blogger.com,1999:blog-6847048658257278783.post-70795200859131834832023-10-24T08:26:02.002+01:002023-10-24T08:26:02.002+01:00Built this and it sounded great when it was guitar...Built this and it sounded great when it was guitar into pedal into amp. When I put it on my pedalboard after the distortion and overdrive pedals, output and gain dropped massively. Could not figure out what was going on. The problem ended up being the Boss DS-2 right before it. Once that was out of the chain, it was back to normal. So if yours is sounding wimpy, that might be it. <br /><br />Also, mine sounded best right after a buffer. Since I didn't have one where I wanted to put this, I ended up building a JHS Little Black Buffer and throwing that in the same enclosure wired to the input jack and out to the 3PDT. Done and done. Silvahttps://www.blogger.com/profile/02808859290038237304noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-72385379954039946342022-08-06T13:44:59.578+01:002022-08-06T13:44:59.578+01:00Built this and its mint, better than the Bassman 5...Built this and its mint, better than the Bassman 5F6Ianhttps://www.blogger.com/profile/15254004060035345343noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-71969496954583262602021-04-04T02:45:41.922+01:002021-04-04T02:45:41.922+01:00Well i build this, sounds great but i have a coupl...Well i build this, sounds great but i have a couple of issues going on. Vol pot its not responding well, nothing changes. Also, if i turn the bass gain to 0. Kills the output completely even when im ussing the treble channel only. Unknownhttps://www.blogger.com/profile/05940089935915515367noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-73135669445330766172020-12-06T21:38:19.494+00:002020-12-06T21:38:19.494+00:00could i build this like a combo amp? of course usi...could i build this like a combo amp? of course using a separated power and why these have many schematic? this pre amp use only transistor? sorry for all questions <br />Anonymoushttps://www.blogger.com/profile/11048713883360034958noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-17842282083957114502020-06-18T04:52:22.066+01:002020-06-18T04:52:22.066+01:00This comment has been removed by the author.petey twofingerhttps://www.blogger.com/profile/06740368817236312111noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-27800165294584565262020-03-24T19:33:53.440+00:002020-03-24T19:33:53.440+00:00nice work therenice work therepetey twofingerhttps://www.blogger.com/profile/06740368817236312111noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-44167216442932608822020-03-23T22:30:21.368+00:002020-03-23T22:30:21.368+00:00Hey Zach, thanks gain for the layouts, I really di...Hey Zach, thanks gain for the layouts, I really dig this preamp serie !<br />I put one of these Supergroups in a homemade 8" combo in front of a TI class D poweramp, powered with a 12v battery so I can drag it around the workbench. Then I did the same project in stompbox format with a 24v PSU to bring as a backup to shows :)<br />https://imgur.com/a/7rAnNGANoisyBenhttps://www.blogger.com/profile/08241536383231952508noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-48039580458524666882019-06-02T17:37:53.712+01:002019-06-02T17:37:53.712+01:00Could I just turn down the gain pots to "swit...Could I just turn down the gain pots to "switch" between channels on the jumped version? brandonhttps://www.blogger.com/profile/03115475661286750724noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-67211803486967705982018-11-09T11:55:22.510+00:002018-11-09T11:55:22.510+00:00Just an idea - perhaps to make biasing accurately ...Just an idea - perhaps to make biasing accurately easier you could add say a 10K resistor from the 9V to a rail feeding the bias pots - then maybe you could use 20-25K pots? I don't know where the sweet spot is but I doubt you would need less than 10K to bias the 201s.<br /><br />Just an idea - trying to help!HamishRhttps://www.blogger.com/profile/05650034409087553720noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-38063122862623876232018-11-08T09:03:28.001+00:002018-11-08T09:03:28.001+00:00Thanks, man! Definitely a pedal to build!Thanks, man! Definitely a pedal to build!Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-47501923706756799832018-11-08T04:07:02.023+00:002018-11-08T04:07:02.023+00:00One more vid. This preamp is the gift that keeps o...One more vid. This preamp is the gift that keeps on giving.<br />https://www.instagram.com/p/Bp3Ea3dldxQ/neal gardnerhttps://www.blogger.com/profile/14201049471234984485noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-75665018562060156252018-11-07T17:54:25.336+00:002018-11-07T17:54:25.336+00:00Nope, just adjust bias on trimmers.Nope, just adjust bias on trimmers.Alex Philippehttps://www.blogger.com/profile/12654038874106594024noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-66817470119545155782018-11-07T17:26:31.007+00:002018-11-07T17:26:31.007+00:00Jfet need to be match or not...sory newbie here......Jfet need to be match or not...sory newbie here...Anonymoushttps://www.blogger.com/profile/11985130613642958311noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-81473393939908212712018-10-29T02:33:43.504+00:002018-10-29T02:33:43.504+00:00Demo here:
https://youtu.be/GyunFwacU3EDemo here:<br />https://youtu.be/GyunFwacU3Eneal gardnerhttps://www.blogger.com/profile/14201049471234984485noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-39371770549017933342018-10-28T22:16:03.949+00:002018-10-28T22:16:03.949+00:00Apologies for the late response on the video. I ju...Apologies for the late response on the video. I just got around to boxing this thing up. First and foremost, a huge THANK YOU to Zach. These preamp circuits are incredible. Nice work, mate.<br />If you're a solid state amp user (like me, Roland JC-120), you'll find this Laney preamp a welcome addition to your sonic toolkit. It sounds incredible. To hear my amp break up, and with so much punch, was a revelation. It is indeed tube-like. <br />Here's a very quickie vid I posted to instagram. It doesn't do the sound justice, so I'll throw together a proper vid asap. <br />https://www.instagram.com/p/BpfFlVNl6HY/?taken-by=nealgardner<br />neal gardnerhttps://www.blogger.com/profile/14201049471234984485noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43554507682311254632018-10-04T14:32:29.601+01:002018-10-04T14:32:29.601+01:00Hi Andrew, thanks for the reply! I tried this, but...Hi Andrew, thanks for the reply! I tried this, but I don't get much volume out of the ruby and the preamp makes it clip in a nasty way. Did you experience the same issue?Juan Felthttps://www.blogger.com/profile/08981768775466303284noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57367259440355936372018-10-03T23:39:58.865+01:002018-10-03T23:39:58.865+01:00I did something similar, but used the ROG Tonemend...I did something similar, but used the ROG Tonemender. I ran that into the ROG ruby (I omitted the gain) with no issues. So at best guess I would say yes, output of Laney to input of headphone amp.Charvel502https://www.blogger.com/profile/17388766834343890636noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-42204825398112360122018-09-28T14:25:43.076+01:002018-09-28T14:25:43.076+01:00Hi! I want to use this preamp before a headphone a...Hi! I want to use this preamp before a headphone amp, and to feed it fx pedals. I'm using a simple lm386 based headphone amp, do I just plug the output of the preamp to the amp, or do I need to take any special attention to something? Thanks!Juan Felthttps://www.blogger.com/profile/08981768775466303284noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-85699880063238634242018-08-30T01:17:14.892+01:002018-08-30T01:17:14.892+01:00hey man. i'll address all your comments in the...hey man. i'll address all your comments in the same order.<br /><br />1.the supergroup, as well as marshall plexi, sunn model t, and many other amps are based on the fender bassman. the two inputs are not parallel because they are 2 separate inputs, as such the input resistor is 68k.<br /><br />2. the 220pF caps are there to help the FET better emulate a tube. read this "http://www.runoffgroove.com/fetzervalve.html" to get an understanding.<br /><br />3. according to the schematic i have the cap is 220pF. i'm sure over the years there have been variations in some of the values, and i'm sure either are correct. <br /><br />4. as above. according to the schematic i have those caps are 25uF not 16uF. while i know there are variations over the years of an amps production i highly doubt it was 16uF.Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-21270788688631434822018-08-25T17:26:53.882+01:002018-08-25T17:26:53.882+01:00A couple things in regard to this layout...
If it...A couple things in regard to this layout...<br /><br />If it's supposed to mimic the SuperGroup, I see a couple problems!<br /><br />1. the input resistor is 68k, but should be 34k as the two on the original amp are 68k's in parallel (correct me if I'm wrong), just like on a Plexi.<br /><br />2. For some reason someone added 220p caps to the input grid (or Gate) of the 1st and second gain stages! Why??<br /><br />3. The layout has a 220p across the 470k resistor. The original valud is a 270p, not 220p.<br /><br />4. Lastly, the original amp is very loosy-goosy. This layout shows 25uF electrolytic cap, but the original uses 16uF, so maybe this should be lowered also!<br /><br />My $0.02. Let me know if any comments about the above.Equinoxhttps://www.blogger.com/profile/09337078329528823238noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-87335509789095513892018-08-25T12:40:57.455+01:002018-08-25T12:40:57.455+01:00Cool! Finally looking forward to hearing how this...Cool! Finally looking forward to hearing how this things sounds!!Equinoxhttps://www.blogger.com/profile/09337078329528823238noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-15912390076557969652018-08-21T12:24:01.899+01:002018-08-21T12:24:01.899+01:00Give it a shot. Give it a shot. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40988999328051139712018-08-21T08:35:44.570+01:002018-08-21T08:35:44.570+01:00Thank you, Zach. Then maybe an intermediate value ...Thank you, Zach. Then maybe an intermediate value like a 50k could be a good choice?Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43802093587541274022018-08-20T21:47:02.196+01:002018-08-20T21:47:02.196+01:00You should be able to do it with 20k like the mode...You should be able to do it with 20k like the model t layout. Keep in mind that higher voltage will need a larger value trimmer. Zachhttps://www.blogger.com/profile/00044917566185720896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-76331725035555998802018-08-20T21:20:47.111+01:002018-08-20T21:20:47.111+01:00Thank you, Colin!
I still didn't look inside t...Thank you, Colin!<br />I still didn't look inside the schematic, but do someone think that there's some better adjustable value of that trimmer? Or any other easy method to adjust it?<br />Thanks!Elijah-Baleyhttps://www.blogger.com/profile/16374916649117645180noreply@blogger.com