Tube spring reverb standalone diy guitar amp with hammond organ spring reverb diy spring reverb pre and postamps gearslutz add reverb tremolo spring reverb. A twostage overdrive pedal composed of an op amp flowing into a fet, the mxr fet driver does an amazing job of emulating creamy tube amp breakup. Many such amplifiers use tubes for their sonic and overdrive characteristics, but for interfacing to a spring reverb, the monolithic op amp offers superior capabilities. Spring reverb was invented by hammond and first used in their organs to liven up the tone in acoustically flat church interiors. Mosfet spring reverb driver solid state guitar amp forum. When replacing the reverb tank in an existing amplifier design, it is important to match. The driver stage also requires a voltage amplifier to drive the reverb tank driver, meaning you would need at least a single 12ax7 section to drive the 12at7 tank driver.
The second amplifier u1b drivers the spring reverb. It uses a single, less than one dollar tl072cp op amp as the reverb driver and reverb recovery amps. Build your own spring reverb tape op magazine longform. The 1k r629 will be for both level matching and impedance matching because the 709 like any opamp has very limited drive ability. When the reverb control is turned up, instead of getting reverb i get lots of nasty distortion. Play it with a reverb pedal until you can find another with working reverb. Dr zee workshop silicon driver with spring reverb features.
Ibanez ad9 analog delay 1983 japan sn 300349, mn3205 bbd chip and jrc4558d op amp chip the op amp used in the famous ibanez ts808 tube screamer quote from effects freak. Currentmode driver for reverb pans when people began steering away from thermionic based designs, and replaced the basic building blocks of music amplifiers with solidstate equivalents, one of the things they did was replace the high impedance classa approach to driving reverb spring pans to a lowz op amp one. The reverb circuit used an odd little piezo reverb box roebuck probably couldnt justify the expense of a real hammond tank. Carvin vintage 16 reverb troubleshooting the gear page. This is how i refined the sigma drive spring reverb that i made.
The reverb circuit is inserted just before a guitar amplifiers phase inverter in a pushpull amp or just before the driver last gain stage before the power tube in a single ended amp. Tube spring reverb standalone diy guitar amp with hammond organ. They certainly work well in other production amps and in the ones that i have built. Reverberation made its debut at fender using a spring unit bought from hammond in 1961. May 10, 2018 but their op amp driver circuit makes them great distortion boxes for studio use with louder source material. The unit is a belton bs2bb2e, with the info in the datasheet and the accutronics web site under the application headingmore specific links below, im sure this would be trivial if i had a better idea of what im doing. The reverb driver is a dedicated 23 watt power amp that drives the tank with the power needed to create deep vintage reverb. Apr 28, 2017 the circuits on the input and output of the reverb tank are op amp amplifiers, specifically a noninverting amp.
Spring reverb a flexible, easytobuild voltage controlled. Level and drive controls let you dial in the amount of gain and responsive, organic saturation you want, with hi and lo controls to tweak your tone and a hi cut switch to roll of excess treble in. Ill post up a schematic when i have a few more values, but i was hoping someone could help me with a few questions. Sep 04, 2011 what really small tube combos w spring reverb are on the market. This simple, inexpensive spring tank reverb circuit is taken from the fender hot rod deluxe. The reverb circuit used an odd little piezo reverb box roebuck probably couldnt justify the expense of a. For the reverb driver i have used a 1 watt amplifier n48fl see attachment i have got this to drive the strings in the reverb tank quite nicely but only when i power it with a 12v dc supply connected in parallel with a 9v battery. The transformer adapts the dual op amp output impedance to the reverb driver coil impedance. This doesnt make sense to me because the signal is fed both to the driver stage and also directly to a dry mix 10k pot. So clearly theres a problem with the driver circuit.
The drive circuit for any spring reverb tank is critical by far the most critical part of the final system. Only a couple resistors and capacitors are needed to make a working audio amplifier. Vintage jrc 4558 jrc4558d f op amp based drive section circuit. Ive been using a 1k pot for r10 but this seems to make no difference on the verb.
Ive never understood why an op amp can sound so good as a driver. May 29, 2012 seems like it also might work for studio use to drive the reverb tank from a headphone amp. The radial engineering tank driver is a 500series module that interfaces your pro audio gear with your guitar amps spring reverb tank. In 2011 i published a schematic for a little spring reverb driver based on roy mallorys tech note for using a very simple op amp circuit to drive a spring. It would also be useful to know the characteristics of your spring line unit. But their op amp driver circuit makes them great distortion boxes for studio use with louder source material.
Everything i know about spring reverb music thing modular. Nov 12, 2017 in 2011 i published a schematic for a little spring reverb driver based on roy mallorys tech note for using a very simple op amp circuit to drive a spring. Build a great sounding audio amplifier with bass boost. Too bad, its kinda a cool little amp, and it has a celestion alnico blue, sounds really good when its pushed a bit. On the other end of the spectrum, a standalone fender with a 6v6 driving the tank can slam it pretty hard, while the typical tube combo amp is. This design used a form of current drive similar to rod elliots design most amplifier stages provide constant voltage drive to the load. After thinking about it, im going to take the scums suggestion and use an lm386 to drive the springs. Have other amps in mind to build that might get a little more involved. In essence, it turns any spring reverb tank into an outboard effect with transformercoupled, class a circuitry and balanced linelevel io. As seen from figure 4, the actual reverb drive coil impedance varies over a wide range, but that will not cause stress to the driver circuit shown in figure 7. Aug 20, 20 finally finished my spring reverb module, which consists of a spring tank unit and an amplifier circuit with op amps. Resistors, capacitors and two ics a tl072 dual op amp and a lm3863 as given in the bill of material. In the ab763 schematic below the guitar audio signal is tapped off to the reverb circuit on the input side of the big 3. The wave is a versatile standalone, tubedriven analog spring reverb unit kit.
I think a 1watt combo w spring reverb would be killer, however ive combed the internet and dont see any. The reverb driver amp consists of a phase inverting pushpull circuit made from dual sections of a 5532 high quality audio op amp. The fender reverb unit 6g15 outboard tube, spring reverb equipped effects unit were originally introduced in 1961. The esp pages suggest that a typical opamp does not give enough current to properly. The early 1980s ibanez ad9 analog delay effects pedal made in japan. I made this spring reverb circuit on a whim over the weekend and it works, but i have questions since i am still learning theres a difference in volume between going from my synth through the verb pedal even when its off and going direct to the amp. Builtin spring reverb first came to the fender amplifier with the vibroverb in 1963 and eventually to the rest of the amp line. This cannot really be classed as a real project, because the circuitry is somewhat experimental, and may change quite dramatically depending on the type of spring reverb unit you can actually get your hands on. In practice, an op amp usuallyy has a saturation voltage a bit lower than the expected value. A modern reverb tank consists of drivers, transmission springs, pickups, and a shock mounting system. The reverb driver amp consists of a phase inverting pushpull circuit made from dual sections of a 5532 high quality audio opamp. It may be that using other dual op amps could reduce this noise even further. If you want to add spring reverb to a track during mixing, then a good unit to consider is the demeter rv1 real spring reverb, which is a professional spring reverb designed for studio work.
Solid state spring tank reverb circuit telecaster guitar forum. Fender, magnatone, and ampeg all quickly licensed the technology and adapted it to their amps. The drive coil has a nominal impedance specified at 1khz, but it also has considerable inductance. Input and output transducers each transducer consists of a coil centered around a magnetic lamination and small cylindrical magnets centered in the air gap of the lamination. Hammond organ company invented the spring tank reverb effect in 1960. Unraveling the mysteries of amp reverb uncategorized. Its the only tube reverb i found that had warm mushy reverb instead of surf guitar bright. Vacuum tube reverb circuits traditionally have used a lowimpedance reverb tank. Spring reverb rob robinettes car and tube amp website. It also serves to isolate the ground on one side of the reverb coil from the op amps. Two controls allow you to serve up a wide range of wetness from just a touch to over the top psychedelia. I used a ne5532 op amp for this section, and also for the other sections of my circuit left photo. Spring reverb drive amp im currently designing a new drive amp for my accutronics reverb tank since ive learnt a little bit about electronics.
Unfortunately it looks pretty bad the fender tube reverb reissue is icepicky bright and unless you want to dial back treble to 0 its basically instant surf guitar. Op amp has spring driver coil in feedback path to input. If you have an old amplifier that is not working, you can pull the spring reverb out of the box and set it on a table. This is fine when the load is a resistor in the next stage, but the drivers in reverb lines act almost as pure inductances. The instructions for the spring reverb kit are divided into the 3 main sections of the circuit. This is of utmost importance in applications where a speaker is mounted in the same enclosure as the reverb, such as a guitar amp or organ. The basic circuit is relatively straightforward, and consists of driver and recovery circuitry within the amp, the spring reverb tank figure 1 and a couple of wires connecting the remotely mounted tank with the amplifier electronics. Fender licensed the reverb circuit from hammond and surf guitar was born. Old school spring reverb literally uses the movement of springs to delay and replicate an audio signal. I have a ac4 w a reverb pedal as my practice amp and its cool. And finally some short demos with the specified 3 spring 8eb2c1b tank, just to give an idea of what it sounds like. The only modifications done to the unit are the back panel 14 io and i had my tech replace the op amp positions with socket style and he swapped the op amps out for a more modern. Finally finished my spring reverb module, which consists of a spring tank unit and an amplifier circuit with op amps. I could try a tda 7052a i have around 1w btl power amp ic while im waiting for the parts.
Self contained small diy spring reverb tape op diy spring reverb driver message board di mei 17, 2008. In its day it was a real wonder, but it has long been overtaken by op amps of the tl07x and tl08x generation, which in turn have been overtaken by op amps specifically intended for audio applications like. Shop reverb s collection of new, used and vintage analog reverb units. Orban 111b 2channel spring reverb unit in pretty darned good condition. So, i have a small spring reverb unit which i would like to put to use, but have a few questions about driving the transducers. Sip7 single op amp used in the ds1, cs1, and other rolandboss products. Solid state spring tank reverb circuit telecaster guitar.
You would also need another 12ax7 section on the output to amplify the reverb tank output to something actually useable. If you look at common ics they dont work with much current, so the 1 watt peak drive of a reverb tank falls short by quite a bit. May 19, 2012 this is how i refined the sigma drive spring reverb that i made. Shinei er23 echo reverb master this pedallike unit from the famous japanese maker of fuzz boxes including the univox super fuzz and shaftesbury duo fuzz doesnt appear to have made it outside the domestic market, which is a shame. This provides a voltage swing of approximate twice the supply voltage to the reverb impedance matching transformer, allowing higher power transfer. I dont use reverb so, to me if the amp works that is good enough. There are a couple of weak spots in the amp, and the reverb is probably at the top of the list. I am planing on putting a tank in a champ sized amp, a 17 length might be a bit much. You dont need to use tubes, a simple circuit like link i posted above is sufficient, as is the method described in the ty is pretty article. Vintage high impedance springreverb tank driven by a modified old school transistor drive and recovery circuit design with added output buffer amp, tonebody control, feedback switch, pre and. He left the other channel original for me to compare. The driver, at maximum expected input level, should drive the coil to near saturation. However, when playing a string, with reverb on, if im honest, all you really hear out the speaker is that spring sound again. There are three varieties of the lm386, each with different output power.
Transformerless reverb driver channel road amplification. This fantastic effect was lightweight and inexpensive, making it very adaptable to both organs and guitar amplifiers. Getting 17v rms at 6khz is easy, and only needs an input voltage of a little over 1. This article considers only the driver stage, and not the reverb recovery stage which is usually a simple triode gain stage, unfortunately. The main components used to produce the spring reverb effect are. Information on driving spring reverb using valves tubes seems to be rather sparse, so the following is presented as a guide to valve amp designers. Jul 09, 2016 vintage high impedance spring reverb tank driven by a modified old school transistor drive and recovery circuit design with added output buffer amp, tonebody control, feedback switch, pre and. Built the stage center as a stand alone unit with the spring reverb tank inside it was a pedal that is about 35 cm long by 15 cm high and wide. Everything i know about spring reverb music thing modular notes.
I made a spring reverb driver, but i noticed a drop in. A 50k linear pot some wire to connect the board with the coils and the sockets, 2 trs jacks one stereo for input and output, a battery connector andor a power supply socket, and some stripboard. It is recommended that the driver be a current or voltage source with an. Spring reverb units are most commonly used in guitar amps, having been replaced by digital effects in most other areas. The reverb circuit is inserted just before a guitar amplifiers phase inverter in a pushpull amp or just before the driver. Igs audio springtime reverb free shipping from atlas pro audio. Apr 29, 2012 the basic circuit is relatively straightforward, and consists of driver and recovery circuitry within the amp, the spring reverb tank figure 1 and a couple of wires connecting the remotely mounted tank with the amplifier electronics. I dont know about the tl072, but some opamps can be tricked into thinking they have a split supply and some. I always thought those opamps made excellent constantcurrent reverb drivers, but ive never tried a hrd. Spring reverb is a strange, gnarly, physical effect. This is another one that might be worth investigating. This provides a voltage swing of approximate twice the supply voltage to the reverb impedance. Operational amplifier opamp tester amplified parts. It can be used in front of your guitar amp or as a linelevel analog reverb effect for the recording studio.
It was issued with the mn3205 bbd chip and mn3102 clock driver along with the famous jrc4558d op. Speaking of, thinking of putting a short delay on the signal before it gets to the reverb amp. Self contained small diy spring reverb tape op diy spring reverb driver message board di. I checked the spring reverb by using a headphone amp to power an aux send from my mixer, so it does work, it just needs a lot of gain. The circuits on the input and output of the reverb tank are op amp amplifiers, specifically a noninverting amp. I do find one of his op amp choices a wee bit curious and i really think we could easily do better than the trusty old 741 as a predriver. The drive stage design would come from the same site and needs to be a current drive amp as the spring reverb tank uses coils as transducers, so it is needed to compensate. Its as cheap as doing it with discrete parts, and i dont think the relatively high distortion will matter. Instrument microphone and line level inputs and outputs. I put it right before the amplifier if using it as a reverb unit for guitar. The chip has options for gain control and bass boost, and it can also be turned into an oscillator capable of outputting sine waves or square waves. Spring reverb tanks explained and compared amplified parts. Reverb short for reverberation simulates the reflected sound from a rooms interior. In 2011 i published a schematic for a little spring reverb driver based on roy mallorys tech note for using a very simple op amp circuit to drive.
649 1595 1369 1246 569 1577 524 256 163 1035 1212 1133 1266 908 901 1103 452 751 1436 563 533 557 439 280 1525 1578 1331 413 1332 947 49 1319 520 1063 984 856