What's On Your Workbench?

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SurfGuitar101 Forums » Gear »

What's On Your Workbench?

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slopoke Joined: Dec 24, 2013 Posts: 145 Maribor	Posted on Apr 16 2015 03:14 PM I ordered a Champ kit from Amp Maker, in England, to replace the burned out pc board chassis in an old Laney LC15 combo that's been sitting in storage for years. It arrived yesterday afternoon, and I couldn't get to it right away (band practice last night), but this evening I assembled the chassis. I'll be busy with work the next couple of days, but hopefully will get it finished sometime next week. — https://striciizozadja.bandcamp.com/ Top
Badger Joined: Nov 16, 2013 Posts: 4536 Wisconsin	Posted on Apr 16 2015 03:31 PM Champ kit looks fun. I'm currently just toying with a Mosrite Fuzzrite clone. Very leisurely pace... — Wes SoCal ex-pat with a snow shovel DISCLAIMER: The above is opinion/suggestion only & should not be used for mission planning/navigation, tweaking of instruments, beverage selection, or wardrobe choices. Top
slopoke Joined: Dec 24, 2013 Posts: 145 Maribor	Posted on Apr 17 2015 11:16 AM The Iron Butterfly fuzz! I've never had any luck getting a sound I like with a fuzz, but I wouldn't mind trying that one. — https://striciizozadja.bandcamp.com/ Top
Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 18 2015 08:22 AM Apart from the aluminium binding the guitar is done! Still has to be set up and tweaked, but overall a good result. Great tone too! Top
eddiekatcher Joined: Mar 14, 2006 Posts: 2774 Atlanta, GA	Posted on Apr 18 2015 09:17 AM Screaming yellow zonker....! ed — Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps? Top
Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 18 2015 09:37 AM I'm more of a clean amp guy, but I have to say this thing rocks on a Tweed Deluxe! Top
JakeDobner Joined: Feb 26, 2006 Posts: 12159 Seattle	Posted on Apr 18 2015 10:53 AM That thing is rad! Reminds me of a Supro Tosca. Top
bjoish Joined: Jul 06, 2010 Posts: 596 Stockholm	Posted on Apr 24 2015 03:52 PM Some time ago, JObeast asked me if it would be possible to build a FET version of the Magnatone vibrato. I got interested and couldn't resist the challenge The interesting thing about this vibrato is the use of varistors to modulate the phase shift. Magnatone describes this like this: http://www.magnatoneamps.com/FMvibrato.html Varistors (variable resistors) are a vital part of the Magnatone vibrato. These are high-voltage, obsolete, old components that are difficult to obtain. The principle is explained at the bottom of this page: http://www.geofex.com/article_folders/phasers/phase.html This pdf describes how varistors can be replaced with ordinary zener diodes. You can even see references to Dinko Tomljanovic (from Bambi Molesters): http://dalmura.com.au/projects/Vibrato%20effect%20measurements.pdf Dinko is using a home built amp with the Magnatone vibrato. https://www.youtube.com/watch?v=6gcVPo-qp9M With very few changes of the original schematic it is possible to emulate the tube/varistor circuit using jFETs/zeners. Tubes are replaced with jFETs and varistors with 3.3v zeners. http://www.magnatoneamps.com/schematics/magnatone_280B.png The phase shift oscillator need high gain to oscillate, so a 'mu-amp' circuit was added to increase the gain. (Same as used for the FET Reverb recovery gain stage) ++ The sound is very good, unfortunately I have no real Magnatone to compare with. ++ The principle of the original circuit is based on a few compromises and non-linearities. I think this JFET version has retained most of the original tone. ++ Only 2.6 mA current consumption (9V battery) -- 60 components for a mono version. Probably ~100 for a stereo version, quite a lot. -- 9V is close to the minimum possible supply voltage. Probably need some tweaking for optimum operation at 9V. Last edited: Apr 24, 2015 15:57:47 Top
sonni Joined: Nov 08, 2006 Posts: 80 Vienna, Austria	Posted on Apr 24 2015 11:06 PM now that's interesting! is there going to be a FET vibrato like the surfy bear FET reverb? Top
SanchoPansen Joined: Jan 04, 2011 Posts: 1588 Berlin L-Berg	Posted on Apr 24 2015 11:47 PM Perfect addition to my SB. Hope you will sell those. — The Hicadoolas Top
CrazyAces Joined: Jul 31, 2012 Posts: 4052 Nashville, TN.	Posted on Apr 25 2015 07:55 AM Another great idea and execution Bjorn. Cheers, Jeff — http://www.facebook.com/CrazyAcesMusic http://www.youtube.com/user/crazyacesrock http://www.reverbnation.com/crazyacesmusic Top
JObeast Joined: Jul 24, 2012 Posts: 2762 Finknabad, Squinkistan	Posted on Apr 25 2015 08:13 AM Glad I put that bee in your bonnet, Bjorn! You pull this one off and you will single-handedly dominate the DIY vintage-emulation circuit marketplace and win a special place in the hearts of all us vintage-tone-addict guitarists who aren't afraid of a soldering iron. So, somebody please lend Bjorn a Magnatone by which he can compare his new circuit gto perfect it and bring it to market! — Squink Out! Top
eddiekatcher Joined: Mar 14, 2006 Posts: 2774 Atlanta, GA	Posted on Apr 25 2015 09:00 AM Put both Surfy Bears circuits in parallel in a small sized Fender reverb clone cab......way cool. Make them patchable so you can choose which one drives the other. ed — Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps? Top
bjoish Joined: Jul 06, 2010 Posts: 596 Stockholm	Posted on Apr 25 2015 02:13 PM Thanks guys This forum is fantastic, I got lots of interesting suggestions and comments from the nice people here!! I just wish I had more time for building stuff. Right now I work hard with new FET Reverb stuff that I will showcase at Surfer Joes in June (if everything goes as planned). After that it would be fun to continue with the vibrato experiments. What do you think, is it important that the PCB is designed to fit in a small stompbox? 100 smd components is a lot, but doable. Top
PrestonRice Joined: Oct 05, 2012 Posts: 1725 Austin, Texas	Posted on Apr 25 2015 04:12 PM I'd love to put one of those together once you have them up and going! — IMO. Top
sonni Joined: Nov 08, 2006 Posts: 80 Vienna, Austria	Posted on Apr 25 2015 04:45 PM THE uber-cool solution like what eddiekatcher suggests doesn't care too much about the small PCB, as long as we have the spring tank, we need a big cab anyway! the DIY lads might even be rather skeptical towards smd stuff in terms of service- and moddability? for the bigger market, those micro-pedals with tiniest PCBs are certainly trendy. on the other hand, also modular effects pedals are quite hot, and that's what eddies idea might aim at... to add a fuzz, a driver or a delay, there's enough space in a reverb tank. patchable, of course Top
JakeDobner Joined: Feb 26, 2006 Posts: 12159 Seattle	Posted on Apr 25 2015 04:50 PM I would buy one in a second if it fit in a small pedal, I would mount the tank on the underside of my pedal board. Top
Gilette Joined: May 04, 2014 Posts: 734	Posted on Apr 26 2015 06:53 AM Finally we got the faux 'HarmoMetal' around the body. As soon as the fret file arrives we'll be able to give it a final setup and then we're really done. Top
CrazyAces Joined: Jul 31, 2012 Posts: 4052 Nashville, TN.	Posted on Apr 26 2015 11:06 AM Gilette wrote: Finally we got the faux 'HarmoMetal' around the body. As soon as the fret file arrives we'll be able to give it a final setup and then we're really done. Great job! What did you end up using for the metal trim? Cheers, Jeff — http://www.facebook.com/CrazyAcesMusic http://www.youtube.com/user/crazyacesrock http://www.reverbnation.com/crazyacesmusic Top
eddiekatcher Joined: Mar 14, 2006 Posts: 2774 Atlanta, GA	Posted on Apr 26 2015 11:37 AM If I was fiddling around with mating up SB Reverb and Vibrato cards, I'd build a small flat cabinet just tall enough to have the a sized tank lying flat in it, suspended by springs as per a normal tank but flat with the PC cards directly above it, then I would arrange the controls so that they were addressable from the top side. Put some tall rubber feet on the cabinet to clear the amp's handle and have this bad boy sitting on top of my amp where I could get to it. Put in a tuner circuit and wah-la! I hate crap on the floor. I am always stumbling over cables and tuners, my tank..... If it is on the floor, I am going to trash it. By the way Gillette, that is one cool "workbench project." Clumsy bumpkin, Ed — Traditional........speak softly and play through a big blonde amp. Did I mention that I still like big blonde amps? Top

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