The Wave

The Wave is a versatile stand-alone, tube-driven analog spring-reverb-unit kit. It can be used in front of your guitar amp or as a line-level analog reverb effect for the recording studio. Two controls allow you to serve up a wide range of wetness from just a touch to over the top psychedelia. The "Dwell" control adjusts the input signal level driving the tank and the "Reverb" control adjusts the level of output reverberations from the tank. The Wave’s all tube design utilizes four dual triode vacuum tubes - three 12AX7s and one 12AT7 - and comes with a MOD® three-spring reverb tank. MOD® reverb tanks are deemed the closest to the original reverb tanks from the '60s made today. The Wave’s reverb function can be switched in and out pop-free via the front panel toggle or with a foot switch (purchased separately).

The Wave has standard ¼ inch in-and-out guitar jacks in the front for use with your guitar and amp, and standard RCA in-and-out jacks in the back panel for use in a recording environment. The Wave is equipped to be rack mounted using just under 3U of space and is approximately 11 inches deep front to back. Four large rubber feet allow the Wave to be safely placed on top of most contemporary guitar amplifier heads and combos for stage use, and it fits into a rack without having to remove the feet.  The Wave comes with a pre-punched powder coated steel chassis, easy-to-follow instructions and all necessary parts.

For use in countries with a 240VAC mains, the Hammond 290WEX can be used in place of the included power transformer. The 290WEX cannot be substituted in the kit and will need to be purchased separately.

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Questions and Answers
Click each question to see its answers. Looking for general answers about Mod Kits? See our frequently asked questions.
Can I swap out different reverb tanks?
Answers (2)
MichaelT
Staff Member
March 6th, 2018
We do not sell The Wave with alternate reverb tanks, but you can swap out the included tank for a suitable replacement on your own. The included tank is a MOD® 9AB3C1B, a 3-spring long decay tank. The 9AB2C1B (medium decay) and the 9AB1C1B (short decay) tanks are great replacements if you simply desire to change the decay length. 4AB3C1B, 4AB2C1B and 4AB1C1B are all acceptable 2-spring replacements. Amplified Parts offers many of these reverb tanks.
Anonymous
March 17th, 2019
Do you sell the chassis separately?
Is there a 240V mains power version of The Wave?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
No, but the Hammond Manufacturing 290WEX is a 240V mains power transformer that could be used as a drop in replacement for The Wave's 120V mains power transformer. You can find it here: https://www.amplifiedparts.com/products/P-T290WEX
Is this based on any specific vintage reverb units or was it designed completely from scratch?
Answers (1)
MichaelT
Staff Member
May 7th, 2018
The Wave is a new design.
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Why does the volume drop when reverb is turned on?
Answers (1)
MichaelT
Staff Member
August 9th, 2018
This is because the signals are mixed passively.
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In the spec sheet the secondary of P-TF 47609 is 306 V, but in the schematic it is 244 V. Why did this difference occur?
Answers (1)
MichaelT
Staff Member
August 27th, 2018
The sheet from the manufacturer seems to be inaccurate. The unloaded AC voltage measure for this transformer is 258v. 244v under load in the Wave.
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I built one of these a while ago, but I don't remember seeing the Min Dwell Mod (Dwell Ground Mod). Can you tell me what this does? Thanks, Peter K
Answers (1)
MichaelT
Staff Member
September 10th, 2018
Hey Peter. That's only useful if you find that there's a buzz type sound with the Dwell turned all of the way down. This only happens on some builds and eliminates the buzz if it's there.
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Would this work in Japan 100V?
Answers (2)
MichaelT
Staff Member
February 21st, 2019
The transformer in the kit is rated for 120V. We have never tested it on anything lower than 120V. It may require a step up transformer.
Verified Answer
Anonymous
March 27th, 2019
I built wave in Japan. I used toei transformer P-60B 250v tap. The 1K resistance of the smoothing circuit needs to be adjusted. In addition, additional processing of the chassis is required.
Could one use the second half of V4 to amplify after mixing of dry/wet signals, to counter the volume drop? Why didn't you config it that way and left an unused triode?
Answers (1)
MichaelT
Staff Member
March 8th, 2019
All of the design choices are trying to keep a balance of functionality, cost, and making sure things do not get too difficult for beginner builders. We encourage users to modify and personalize their builds as much as possible.
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Is there a mix knob on this and does the mix go to 100% wet?
Answers (2)
MichaelT
Staff Member
July 3rd, 2019
The reverb knobs mixes the wet into the dry signal but will not go to 100% wet since the dry is unaffected. The Wave can be modified for dry control to set the dry level or remove it completely but drilling a panel hole would be necessary along with the extra circuitry.
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Anonymous
January 18th, 2020
Does anybody have an hints on how to do achieve this mod? Would a passive volume circuit after V4 on the schematic work as a 'dry volume'? And if so, what value VR would be best?
The instructions for The Wave, step 5, point two: "Cut two lengths... Connect one of these wires to T1(1) and the other wire to T1(3)... Connect one of these wire ends to pin 9 and the other wire end to both pins 4 and 5..." WHICH WIRE? The very next point, point three says "Connect one of the wire ends to V3 pin 9 and the other wire end to both V3 pins 4 and 5." Once again, which one of the two wires goes to pin nine and which one goes to pins 4 and 5? It just says "connect one to X and the other to Y" like it doesn't matter. Wait, does it matter?
Answers (1)
MichaelT
Staff Member
September 13th, 2019
The green wires carry the AC filament voltage to the filaments on the tubes. The polarity (or which wire connects to 4, 5 and which connects to 9) is not critical to the operation of the Wave. You can connect either.
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Hello, My name is Marcos G and am currently a lab specialist in the Record Arts program at Full Sail. I am looking at your wave tube spring reverb kit and was wondering if you offer a discount for educators? Any information you have will be helpful. Thank you - Marcos G
Answers (1)
MichaelT
Staff Member
November 12th, 2019
Hey Marcos. Please contact us at info@modkitsdiy.com.
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Hi, just got my Wave kit and looking forward to diving in. Do you offer, or can you suggest, a mod that would give me a tone control (or, ideally, two: a low cut and a high cut) for the reverb signal? Seems there would be space for another knob or two on the front panel between the OUT and the lamp. Also, would this theoretically be easy enough to mod after building the kit as-is, or would it make a ton more sense to do it at the same time as the main build? I’ve DIY’ed some smaller things and know my way around a soldering iron, but am not experienced enough with electronics to wing it. TIA, /ASH
Answers (1)
MichaelT
Staff Member
December 12th, 2019
We've never experimented with tone control for the wet signal so we don't have any suggestions. You might want to take look at tone stacks from tube amps to get some ideas on how to implement it.
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I’ve got this kit together and it sounds pretty good but I don’t think it’s working at it’s full capacities, pin one of v3 is sort of microphonic when I tap on it, I’ve went back over it with fresh solder and it’s still causing some microphonic noise. I’ve swapped 12ax7’s and it’s not the tubes, although my 12at7 makes a slight jangly sound if I shake it near my ear, is that normal? Will the output mod help? I’m just playing guitar through it.. If anyone has any advise or input that would be awesome.
Answers (1)
MichaelT
Staff Member
February 11th, 2020
Tubes can often make sounds when tapped without being an issue. If the sound is a crackle or pop rather than a thud type sound you might want to check solder the solder joints. Tubes can also has a slight rattling sound if shaken with no problems as well. The best way to determine if there is an issue with you unit is to check the voltages listed on the last pages here: https://www.modkitsdiy.com/sites/modkitsdiy.com/files/media_files/the_wave_instructions.pdf There can be some variation but if there is a large discrepancy you'll want to investigate that area of the circuit.
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Hi, I've spent the last week working on the wave kit. I have no idea what I'm doing wrong at this point because I've gone over eveeything and corrected mistakes and now to the point where I'm not seeing any reason why this device won't power on but still, it's not working. Help please, I'm at a loss at this point.
Answers (1)
MichaelT
Staff Member
March 10th, 2020
Starting on page 31 is the troubleshooting guide. https://www.modkitsdiy.com/sites/modkitsdiy.com/files/media_files/the_wave_instructions.pdf This can help you locate the issue.
Verified Answer
Hum increases as you scale up the Reverb Volume, any idea on how to eliminate this? The grounds are good.
Answers (2)
MichaelT
Staff Member
April 3rd, 2020
Double check the ground connections. The grounded lug on the pots might be a good place to start.
Verified Answer
Anonymous
April 20th, 2020
Turn the Tank around so the input and output jacks face the front/face of the chassis.
I just recently built this. I do enjoy it, however I find that I am only using the first 10-20% of the useable range of the Dwell and Reverb potentiometers. Would changing the values of the potentiometers allow me to gain more fine control in these ranges? If so would I need to increase or decrease the potentiometer resistance? Thank you!
Answers (1)
MichaelT
Staff Member
May 4th, 2020
Changing the resistance of the pots might end up with unexpected behavior. You could try decreasing the pot's value with a resistor in series with it to maintain the resistance of the circuit such as replacing the 10K pot with a 5K resistor in series with a 5K pot. You might need to experiment with different values to find the right combination.
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The phono outs (1 and 2) are not stereo, correct? If using in a studio application, is there a reason to use both phono outs to send back to the recording returns?
Answers (1)
MichaelT
Staff Member
May 14th, 2020
The two RCA output jacks are the same output signal. They can be used to send the signal to two different inputs. There is no need to use both if you only need one output.
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On a scale of 0 to 10, how dangerous is this to build for a beginner? I've only ever build stomp boxes.
Answers (1)
MichaelT
Staff Member
July 6th, 2020
The Wave requires wiring a mains voltage connection as well as potential troubleshooting involving voltages as high as 330VDC. We highly recommend familiarizing yourself with safety precautions before attempting the build so you can competently and safely complete it.
Verified Answer
Any tips on housing a theoretical stereo mod wave? Initial thoughts include putting the tanks on the bottom and the tubes and transformer (s) on top. Or would you all recommend just two separate builds?
Answers (1)
MichaelT
Staff Member
July 20th, 2020
Both ways would have their upsides and downsides. Two separate builds might take up more space in a rack but they would be more flexible if there are times when you wanted to run them each on separate instruments or tracks. The other benefit is that you'd have two ready made enclosures to use.
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I'm getting extreme feedback from the unit when I turn the Dwell knob up past like 7:30 (very low). All of my voltages match pretty well with the troubleshooting sheet. Any idea what part of the circuit I should be poking to figure this out? Thanks!
Answers (1)
MichaelT
Staff Member
August 20th, 2020
Some simple things to try are double checking the orientation of the tank to make sure the ins and outs are connected correctly. The next thing to try is swapping V2 and V4. If the 12AX7 is especially strong, it can cause feedback and swapping it with the 12AT7 can clear this up.
Verified Answer
Is there a way to swap the RCA inputs and outputs on the back of the unit for balanced jacks? I'm trying to connect the Wave Reverb to a balanced patchbay.
Answers (1)
MichaelT
Staff Member
August 25th, 2020
Since these outputs are unbalanced, this would not be possible without additional circuitry.
Verified Answer
I get a high pitched low volume squeal when I turn the reverb knob past 6 or 7. Also the reverb wet signal volume drops when this happens. Otherwise the unit sounds fantastic. I've already swapped v2 and v4. Same exact behavior. Also, I have done the min dwell mod but still get a lot of hum when I turn dwell all the way down. I have checked grounds on all the pots, ground lugs, jacks etc., any ideas about the squeal? I can live with the dwell hum. Thanks
Answers (1)
MichaelT
Staff Member
September 9th, 2020
Sometimes using a small resistor in the range of 10 to 100 ohms from the dwell cold lug to ground can clear up the dwell hum at zero if the standard wire to the back of the pot is not getting rid of it. As for the feedback, the Wave is designed so the reverb can be set just south of getting feedback so with that feature, the device will go into feedback depending on where the knobs are set. Usually dialing back the reverb knob allows you to crank the dwell and vice versa, each resulting in a slightly different sound.
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