Schematics reverb tank driver

Unlike the common nylon bobbin wound reverb drivers available on the market today, this is a reasonably priced, vintage constructed, paper layer wound reverb driver. Then the tank can be hidden under the pedalboard or kept on top of the board, this is up to you. The drive circuit for any spring reverb tank is critical by far the most critical part of. Reverb tanks are supplied in a variety of input and output impedances measured at 1khz to allow for flexibility in designing drive and recovery circuits. We created several and we have redrawn some schematics that were already available on the internet for readability or ease of use these needed an easiertoread format, corrections or part identifiers.

A follower whether tube, bjt or mosfet is used when you want to transform an rather high impedance tube plate into a low impedance reverb tank. The input going into the tank seems okay but perhaps its supposed to get a boost. At some point, the tanks z in is so much higher than your drivers z out, that those high frequencies dont make it. But the output of the recovery tube has a reverb level pot that can provide a dc resistance path to ground. How do i know which preamp tube is the reverb driver. Schematics and layout diagrams here are hundreds of original fender schematics and layout diagrams, available for free viewing and download. The weak wet signal generated by the transducer output coil is then amplified by the reverb recovery amplifier and flows through the reverb level volume pot and back to the amplifier. Vacuum tube reverb circuits traditionally have used a lowimpedance reverb tank coupled to the driver tube by a small output transformer. All this information is available from the accutronics website and can also be seen below. The only tool we will really need today is a screw driver to free our reverb tank from the cabinet apart from that, you will want to have an. Footswitch jack insertion rear panel cancels the operation of this switch. By the time the signal gets to the end of the reverb tank, it is transformed. This is the standard tank used in fender amps which as also use reverb driver transformer with an. Im not sure if it will definitely work but the first tank i would try is the 4ab3c1b.

For example, fender typically uses two parallel sections of an 12at7 in a class a single ended circuit as the reverb tank driver in their tube amplifiers. We believe that this is the most complete, highest resolutio. Now i want to match the driver to it and try to shape the sound of it. Note that the information presented in this article is for reference purposes only. Unlike driving a speaker, the drive signal to a reverb tank is ideally not flat, with respect to frequency. Input impedance 8 ohms, output impedance 2250 ohms, long decay 2. The signal coming out of the reverb driver and going into the tank is virtually identical to the signal at earlier points along the signal path before the reverb driver.

The correct replacement tank for the premier 90 is the accutronics 4ab3a1b. There are many varieties of tube and solid state drive and recovery circuits used in guitar amplification resulting in different input and output impedances. Avoid mounting the outer channel of the reverb tank directly to the mounting surface by using grommets, rubber standoffs, reverb tank bag and liner or other products designed for mechanical isolation. The commonly used driver circuit drives a low impedance tank via a small transformer. But that is not the only way to drive a reverb tank using a vacuum tube, and in fact it is not the best way.

In reality, we can have a power driver or a current driver, because with a power driver current is amplified as well. And finally some short demos with the specified 3 spring 8eb2c1b tank, just to give an idea of what it sounds like. Sr1 spring reverb build guide the instructions for the spring reverb kit are divided into the 3 main sections of the circuit. The reverb on the amp is kind of noisy and drives me nuts. Bass 150 dmi large schematic, left side bass 150 dmi large schematic, right side bass 150 dmi tube layout diagram. Making a reverb unit out of a reverb tank question the. For the actual hardware, here is the schematic diagram of the reverb pedal circuit figure 6.

Spring reverb tanks explained and compared antique electronic. Mfos voltage controlled analog spring reverb module. A reverb tank is simply made up of two transducers connected by two or more springs. It has decay time control, room size control, and drywet balance control. Here is a list of the schematics that are exclusive to this site. Remove the 6v6 or 6l6 output tubes to disable sound coming from the main speaker. Spring reverb tanks are used to create a unique reverberation effect in guitar amps and organs. Please, follow these basic instructions to place your order. Reverb tank driver web hosting website, hosting company. 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.

The reverb drive is basically a fourwatt output amplifier consisting of a 12at7 tube and a reverb driver transformer. Build your own spring reverb tape op magazine longform. This is my secondgeneration solidstate guitar reverb circuit. These schematics are examples of drive and recovery circuits from popular guitar amplifiers. Antique electronic supply makes no claims, promises, or guarantees about the accuracy, completeness, or adequacy of the contents of this article, and expressly disclaims liability for errors or omissions on the part of the author. I have the manual, which shows the tube positions v1 v7. How to build your own spring reverb unit all things. Information on driving spring reverb using valves tubes seems to be rather sparse, so the following is. It uses a single, less than one dollar tl072cp op amp as the reverb driver and reverb recovery amps.

A tube with a few ma of drive capability is the usual choice. Reverb tanks 8type 9 inch 3spring tank 4type 17 inch 2spring tanks. Accutronics products and specifications there are a number of different types of reverb tanks available. The output of the reverb tank is sent to the reverb. These can be determined by the numbers on the unit whilst visiting the accutronics site. The sections should be individually built and tested one after the other, as opposed to building the entire unit all at once. I looked at putting the spring tank connections on a single socket, having missed out on putting an separate output for reverb only, but because. We offer professional and affordable website hosting plans. The reverb tank should be isolated from vibrating surfaces as much as possible. Compared from other spring reverb that use huge boxes, the tank is detached from the pedal, and connected by a cable. Add only the numerical characters of the item number. I used a typical fender replacement reverb tank and trannie for the one tube reverb. The fidelity is much improved over the earlier design, it is suitable for use as a frontend to a guitar amplifier.

To be clear, it requires a small power amplifier, rather than voltage amplifier to drive it, so you would have to reproduce that circuit. I am wondering if the reverb driver preamp tube is the culprit. A reverb tank takes a small amount of power to drive it. This tank is a type 4, and has drive coil impedance of 1,475 ohms 1. Even though your tank came in a marshall head, it may have been manufactured by accutronics if not, you may find that yours matches or is very close to the specs of one of theirs. Tl072cpop amp as the reverb driver and reverb recovery amps. In a marshall type build i would put a 150k220k resistor after the master volume and prior to the. Each spring should have different characteristics, to ensure that the unit does not simply create boinging noises. This simple, inexpensive spring tank reverb circuit is taken from the fender hot rod deluxe. Attached is the schematics, the first one is per the hoffman approach and the second is more like the fender blackface approach. The usual choice for a tube amp is something in the 1 to 5 k ohm range, which can be driven from a dc blocked tube plate.

Belton reverb tank, 17 long, 2 spring, 4ab3c1b, current production. Guitar reverbs require a reverb tank driver on the input of the tank. Have now completed the lamington reverb and pretty happy with it. How to wire up a vintage reverb tank as a separate effect. I got this cook spring reverb working, but as per schematic had to connect the negative end on the bottom 0.

While replacing a reverb tank is a pretty straightforward repair to make, there are a few other things we need to test for before we can say for certain that our issue is, in fact, the reverb tank. The longer the tank the longer the reverb reflections. The lamington reverb a better valve reverb unit valve. Fender heaven schematics shown in blue are missing from the archive. The tank is the load at its input and it is the source at its output. Which tube is the reverb driver calling all fender experts. While the old one has seen better days i think its at least over 30 years old it still works perfectly. Modeling the interface to simulate the insertion points used in the 15r parallel to the tone stack, replacing the reverb tank and driver with an analog pt2399 reverb circuit. The reverb circuit is inserted just before a guitar amplifiers phase inverter in a pushpull amp or just before the driver. So the reverb driver s z out can be equal to or greater than the tank s z in.

Since the maestro also has tremolo, this effect is applied after the reverb effect, which yields a cool sound. The 12au7, 12at7, 6sn7 and equivalents are often chosen. In 2011 i published a schematic for a little spring reverb driver based on roy mallorys tech note for using a very. There are many flavours of reverb tanks and youll need to know the input and output impedances of yours. It use 5 delay line integrated circuit chips, and the block diagram is shown in the figure 4. A signal is driven into the drivers attached to one end of each spring, labeled input, which acts like a speaker. When we relate the above diagram to a reverb tank, there are two sourceloads at play.

El844 and the transformer from the integrated fender reverb circuit. The lamington reverb a better valve reverb unit valve heaven. Hoffman revibe revibe reverb vibrato stand alone unit with the toret revibe mod hoffman revibe pdf. The information contained herein is confidential and proprietary to fender musical instruments corp. The biggest difference is the driver tube a jj el844 and the transformer used. Reverb tanks input and output transducers are inductors. Something neat, if random, that i came across and decided to make a video of. As the frequency of your input signal goes up, the z in of the tank also goes up. When it comes to reverb with real depth, then the fender reverb unit is. Spring reverb tanks explained and compared antique.

I was originally going to show a photo of one i already have, but it looked a bit too gruesome, so i got a new one to do some further experiments with. When we set the room size to minimum, it would sound similar to spring reverb. It is important that the tank input and outputs are grounded to provide a complete signal path for the reverb driver transformer. Unplug the reverb pan, and connect a speaker to the reverb jack labeled reverb. A transformerless constantcurrent reverb driver introduction. I dont really get the idea that the signal to reverb driver needs to be amplified by a separate triode instead of taking the signal from the main signal. The figure 5 circuit is capable of driving an 8 ohm coil to several times the. If you can find a reverb tank with a high impedance driver coil, the transformer may be eliminated, the driver coil will require isolation from ground.

Spring reverb tanks explained and compared amplified parts. Accubell specifies that the signal should rise 6 db per octave to deliver constant current over the frequency range, or to use a constant current driver circuit. After checking various online schematics and reverse engineering a. Connecting to and from the spring reverb and the tank driver is easy and most spring reverbs are clearly marked with input and output. You have a wetdry setup with the driver amp as your dry signal and the maestro as your wet signal.

I think we have different mother boards because my reverb driver 12at7 tube is v6, or before i got this amp someone swapped v5v6 tubes. Using the maestro ga1rt as a stand alone reverbtremolo. This is the standard tank used in fender amps which as also use reverb driver transformer with an 8 ohm secondary. This tank driver is an amplifier with a high impedance front end. Reverb circuit, all models large schematic reverb interface circuit allows the use of an accutronics reverb tank. Premier 90 reverberation mods, schematics and impulse. From the schematic floating around online, this amp has a reverb driver transformer with an 8 ohm secondary. I see on your diagram the mullard preamp tubes fit. An inductors impedance rises in a linear fashion as the frequency rises. Does anyone know what the input should be going into the tank. You would also need another 12ax7 section on the output to amplify the reverb tank output to something actually useable. Primarily used by all fender amplifiers with tube reverb from 19631990.

I started with the accutronics site, but there is not much info which circuit would be best in my case. All kits come with easy to follow instructions and use point to point wiring. Also visible is the 6bx6 tank drive valve and a 12ax7 preamp and recovery valve. A testing in digital domain using deepstomp platform has shown that the basic block diagram of the circuit works fine.

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. I like how you used a jj in v3 to smooth out the gain stage. More information on reverb tanks is also available at rod elliots site. The pt2399 is buffered between the two stages of a ba4560 op amp. Note that the 7247 12dw7 previously mentioned is dual. The basic spring reverb chamber is a simple affair see figure 1, with an input and output transducer, and one or more usually three or four springs lightly stretched between them. And yes, it had quite a bit more reverb then what i am hearing in your demo.

I have created very simple reverb circuit that can simulate spring and room reverb effect. The input and output transducers can be characterized as essentially inductive, with impedance rising with increasing frequency inductive reactance. Bass 150 dmi bass 150 dmi bass 150 dmi large schematic, left side bass 150 dmi large schematic, right side bass 150 dmi tube layout diagram. Driving a reverb spring tank presents some challenges.

Selfdrilling screws are supplied with the tank to help you attach the tank to the desired location on the pedalboard. Tube amp schematics, tube amp information, tube amp projects. Nov 14, 20 i have a fender 3 spring reverb tank that i would like to set up so it can be used. Use an input highpass filter to compensate for the input coils inductive reactance. This article considers only the driver stage, and not the reverb recovery stage which is usually a simple triode gain stage, unfortunately. Accutronics products and specifications antique electronic.

Td752 td752es tube driver amps front panel features left to right tube drive switch selects either tube channel up, or clean channel down. Care and feeding of spring reverb tanks elliott sound products. 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 output of the input buffer drives both the reverb tank driver amp u1. A modern reverb tank consists of drivers, transmission springs, pickups, and a shock mounting system. How to build a tubedriven spring reverb module based on classic. The reverberation effect is created when an audio signal created by a transducer is sent through one or more springs, the movement of the springs is then converted back into an audio signal by another transducer at the other end, creating the unique sound. If the reverb in your amplifier no longer works and you suspect the reverb tank itself is the issue, you can test the tank with an ohmmeter by doing the following. Revisit reverb tanks bringing back the sound of vintage accutronics tanks. Even though your tank came in a marshall head, it may have been manufactured by accutronics if not, you may find that yours matches or is.