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Post by newey on Aug 26, 2020 14:21:26 GMT -5
mpsya-
Hello and Welcome to G-Nutz2!
Looks very nice! What pickups do you have in there? It's also interesting that you chose to move the volume pot and put the killswitch in its place, most people want the volume pot on a Strat in its typical position so that one can do the "pinkie swell" technique.
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mpsya
Rookie Solder Flinger
Posts: 6
Likes: 2
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Post by mpsya on Aug 26, 2020 14:31:29 GMT -5
mpsya- Hello and Welcome to G-Nutz2!Looks very nice! What pickups do you have in there? It's also interesting that you chose to move the volume pot and put the killswitch in its place, most people want the volume pot on a Strat in its typical position so that one can do the "pinkie swell" technique. Ahh cheers! Glad you like it! I've no idea what the pickups are unfortunately. I bought the guitar for cheap years ago from someone who had bought it from someone else who had bought it from someone else... I'm more of a palm muter than a pinky sweller so moving the volume pot makes it much easier.
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Post by thetragichero on Aug 26, 2020 22:50:02 GMT -5
i dig the look i find the kill switch is better there than a volume pot (often ended up turning myself down with the standard volume pot location). i have a volume pedal at my feet to take care of swells.... leaves my picking hand free to do more stuff
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Post by newey on Aug 27, 2020 7:31:15 GMT -5
(often ended up turning myself down with the standard volume pot location) I have the same problem, so on one of my Strat-ish guitars, I reversed the volume pot wiring to left-handed opertion, so I turn myself up if I accidentally hit the pot.
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Post by gumbo on Aug 27, 2020 9:41:08 GMT -5
(often ended up turning myself down with the standard volume pot location) I have the same problem, so on one of my Strat-ish guitars, I reversed the volume pot wiring to left-handed opertion, so I turn myself up if I accidentally hit the pot. Wow! So yours goes all the way up to 1 !
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Post by thetragichero on Aug 27, 2020 10:02:22 GMT -5
I've done that a ton of times.... by accident
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Post by thetragichero on Sept 7, 2020 22:25:55 GMT -5
back to working on cigar box amp for the old man (might actually get it mostly done before heading up there at the end of the week) basically a supro made outta jfets. power amp board cost me like three bucks, works off 12v and less than 1a got some woodworking to do on the box tomorrow
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Post by frets on Sept 8, 2020 11:13:21 GMT -5
Trag, I’m in the middle of a cigar box build. Did you build the amp yourself? And if so, what’s it based on. You know I’m always looking for amp diagrams. And where did you find that huge cigar box? I can’t quite read the label. I’d love to find one of those. Thanks 😸 - Cindi
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Post by frets on Sept 8, 2020 11:16:07 GMT -5
Trag, Here’s an idea if you make amps in the future based on Class D’s. Old clocks make a great foundation for CG amps.
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Post by thetragichero on Sept 8, 2020 11:46:17 GMT -5
somewhere in my searching i found someone who made a stomp box based on an old supro but using jfets instead of triodes. threw that on the breadboard and did some tweaking (added a "cathode" bypass cap on the second stage so now the gain control goes from clean to dirty... actually sounds better because before gain maxed had slight grit that wasn't all that pleasing) power amp is a tda8932 board that i paid $2.89 for because someone somewhere mentioned how low current draw these are (the plan is to run off some li ion cells) box isn't particularly big. that's a 4" speaker pulled from an organ
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Post by thetragichero on Sept 8, 2020 11:51:53 GMT -5
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Post by frets on Sept 8, 2020 12:44:22 GMT -5
Thanks Trag, I’ve never seen that particular amp before. I appreciate you posting the link. I’ve got about 7 J201’s left. Here are the equivalents 2N4339, 2N4344, 2N4338, 2N4341, 2N5458, 2N5459, NTE458. I think the NTE458 is the closest.
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Post by thetragichero on Sept 8, 2020 13:13:11 GMT -5
it shouldn't really matter all that much for our purposes, especially with a trimmer to figure out the proper drain resistor
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Post by frets on Sept 8, 2020 14:44:02 GMT -5
Trag, I’d be interested in where you found that Supro Board. Given its low draw, I could build a portable using rechargeable 18650’s. You’re putting 12 volts in and how many amps? I ask given 18650’s run amp high when in series. But with 18650’s and the low draw, the amp could run for a significant length of time between recharging. Were you planning on using Li-Ion’s?
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Post by thetragichero on Sept 8, 2020 15:22:40 GMT -5
supro i made on perf this is the power amp board: www.ebay.com/itm/352912983354i have no idea what the actual current draw is but I've been running it on a 600ma 24 ac/dc supply running through a 7912 linear regulator so there ain't even 1a of current for it. probably louder with more current. less than 12v the chip is supposed to go into protect mode
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Post by frets on Sept 8, 2020 20:23:51 GMT -5
How are you planning to power that on batteries?
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Post by thetragichero on Sept 8, 2020 22:07:10 GMT -5
1.5v cells x 8 = 12v. if it's working at 600ma or less 1a should work even better 12v 4Ah should be sufficient
my little brother has messed with li ion batteries more than i have so that'll be in his wheelhouse
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Post by JohnH on Sept 9, 2020 5:57:12 GMT -5
Thanks Trag, I’ve never seen that particular amp before. I appreciate you posting the link. I’ve got about 7 J201’s left. Here are the equivalents 2N4339, 2N4344, 2N4338, 2N4341, 2N5458, 2N5459, NTE458. I think the NTE458 is the closest. I've built a few jfet overdrive circuits, a bit like runnoffgfoove, but following my own ears and nose rather than matching another design. I used mpf102, 2n5457 and j201. My favorite was 2n5457, and I've got most of a 100 pack stored away. They can sometimes give quite different results, mainly because of different bias needs. The amp stages in that Supro design look to be common-source, where the gate is biased to ground and the source and drain resistors are set so source is a certain voltage above ground and the drain is just above mid supply volts. The sourcd voltage is often around 0.75V in a j201, 1.5 to 2V in 2n 5457 and can be 3V for mpf102. Set appropriately, they all work fine, but the resulting ratio of source and drain resistors also determines the gain of the stage. So j201 ends up making much more gain than Mpf102, with 2n5457 in the middle. In 9 and 12V circuits, i found 2n5457 was my favorite for amp-like tone. I see runnoffgroove changed to using them too in their later designs. This was my favotite simple one: guitarnuts2.proboards.com/thread/4987/bluejuice-overdrive-using-jfets
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Post by frets on Sept 9, 2020 14:47:39 GMT -5
John, Thanks, But I wanted to take a minute given that thread starts out with an good overdrive circuit. I’m going to put that one into AutoCad and reduce its original footprint so as to get it to fit in a cavity; albeit, I won’t be using the switches, just the basic configuration. I designed another JFET based overdrive that I’ll share once I get it mocked up. It’s basically a variation of the Electra Distortion. Using smd’s on a pcb board, I can evaluate all 3 finalists for guitar installation.
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Post by thetragichero on Sept 9, 2020 15:52:05 GMT -5
the electra is pretty much perfect. I've spent hours tweaking and making it worse lol
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Post by frets on Sept 10, 2020 10:51:16 GMT -5
Trag et. al., Here is my derivation of the Electra circuit modded to fit a Strat Cavity. This is a very good overdrive module. I will be using Ashcatit’s plug method to turn all three on-board modules on/off. The Chorus circuit is proving difficult to push its size down given the latching circuit. I plan on making the anti-latch on a secondary board that will be attached to the back of the Chorus board. The Delay also uses a PT2399 and will require the anti latch as well. I will be posting the other two once verified.
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Post by thetragichero on Sept 10, 2020 13:12:14 GMT -5
with the delay you can avoid the anti latch but putting say a 2k2 resistor between the delay pot and ground
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Post by thetragichero on Oct 30, 2020 21:29:10 GMT -5
just picked up a Hammond m-111 organ both a 2x 6v6 amp and a 2x ecl86 amp (for the reverb). output transformer for the reverb amp is like three times the size of the main amp. that ecl86 is both a triode and pentode in the same bottle. add another 12ax7 and i should be able to get about 10w or so in push/pull. i see a combo amp in its future
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Post by thetragichero on Oct 31, 2020 16:14:42 GMT -5
as i usually do, here's the transformer measurements
ao-24158 output transformer 8k7:8 (can't believe this was in the ao-44 ecl86 reverb amp and not the 6v6 ao-29 main amp). these are great for 2xel84 amps
ao-24924 output transformer 7k4:8 (puny little thing but should be fine for the ~10w push pull amp i have earmarked for the pair of ecl86/6gw8)
ao-24110 power transformer red-red/yellow-red 350v-0-350v brown-green-brown 6.3vct yellow 5v (3A since this runs a 5u4)
ao-24956 power transformer red-red/yellow-red 275v-0-275v green 6.3v
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Post by frets on Nov 28, 2020 18:54:54 GMT -5
Today I finally got around to wiring up the Passive a Treble Bass Midrange (PTB-M) Les Paul/SG Harness. I posted the diagram some time ago and had help with it from Retread ( Thanks Retread!!😚). I just got done testing it and it is definitely going in my 1988 Les Paul Studio. I am hyped up (as usual) about the tonal diversity this harness affords. I just wanted to let everyone who has a Les Paul, SG, or similar HH 4 controller, and is a tone freak that this harness is the bomb. You can find the diagram in the Guitar Wiring section. I’m not trying to engage in endless promotion, (really) I just wanted to share a somewhat novel harness (adding the midrange) for a four control HH guitar. I think it’s important to share results good or bad when diagrams become reality.
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Post by thetragichero on Jan 12, 2021 3:40:06 GMT -5
got to use up a bunch of salvaged jacks from my parts bin and make an aby pedal for my stereo looping board. there's a loop for the A channel for my other board with delays and a few overdrives, although i labeled the send and return backwards but that's okay. power ground is separate from signal ground because why risk extra noise, right? ground lift for the b channel for the same reason
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Post by unreg on Jan 13, 2021 17:14:33 GMT -5
Stereo looping? Is that like my Analogue Delay pedal? I see a signal delay.
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Post by thetragichero on Jan 13, 2021 18:48:18 GMT -5
two separate amps, dd7 records a and b loops individually so i can play a bassline into b and then switch over to a for lead stuff
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Post by unreg on Jan 14, 2021 1:28:33 GMT -5
two separate amps, dd7 records a and b loops individually so i can play a bassline into b and then switch over to a for lead stuff Ahh... dd7... so it must be a Digital Delay... just looked that up after noticing that the far left pedal says dd7, really cool! 👍😀 One site said DD7 is also equipped with an Analogue Delay. Yours is a BOSS mine is a DOD, though I love my much less-advanced pedal; it’s so fun to play with.
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Post by thetragichero on Jan 14, 2021 3:02:09 GMT -5
I've got a ton of delays... digitech hardware delay/looper has the best sounds but the looping feature is not conducive to live performance. also have a couple of flashback minis (being able to beam different delays from my phone is quite convenient), and a malekko ekko analog delay (absolutely KILLS the carbon copy i replaced with it)
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