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.
Verified Answer
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.
Verified Answer
Is there a mix knob on this and does the mix go to 100% wet?
Answers (1)
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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Hey guys, Looking to use this only as an effect in a recording studio rack, always fully wet from the return. Is this a suitable unit to drive with line level signal from a mixing console. What modification would need to be made to have the signal return to a mixer at line level?
Answers (1)
MichaelT
Staff Member
July 17th, 2019
There are a lot of people using the Wave in studio setups. What I'm unsure about is whether or not they're using external gear to work out any level discrepancies. We don't have a proper mixing console to test it out on but if you want to send us an email at info@modkitsdiy.com we'd be happy to run through some ideas with you. The wet only mod can be easily achieved.
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So, the WAVE is awesome, I have it running in my effects loop. A question: When I have the unit on, but the effect is off, and I flip the effect back on with the mini toggle, I get an almighty pop. And I mean almighty. Doesn't matter if the amp volume is completely down, guitar volume down, all volumes down- in order to avoid the pop I have to turn the amp off, the effect back on, then the amp back on. Same thing happens if I run the WAVE through the front end of the amp. Can you give some guidance on how to mitigate this? Thanks!! Tim Sweeney
Answers (1)
MichaelT
Staff Member
August 12th, 2019
Hey Tim! Send us an email at info@modkitsdiy.com and we can try to help find a remedy for the pop.
Verified Answer
Looking for insight on a wave issue. I have built and repaired a number of 1950 and 60 vintage tube amps. The wave build was great, instructions are excellent. But I have a 60 Hz hum that I cannot track down. It would seem like a simple shield, common or grounding issue but, I cannot locate the cure. The hum occurs anytime the unit is plugged into a tube amp regardless of whether the wave is on or off, reverb on or off, or an instrument attached. It hums with the fuse out of the wave. Pulling the power plug eliminated the hum. There is no hum with a battery powered dc amp, it sounds great. AC coupling.....
Answers (1)
MichaelT
Staff Member
August 27th, 2019
I would first check the sleeve on the output jack. There should be continuity between it and the chassis. Feel free to email us at info@modkitsdiy.com. We'd be happy to help troubleshoot.
Verified Answer
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.
Verified Answer
I recently finished building this kit and went to test it out, but neither the reverb or dwell knobs effected the signal at all. Signal passes through but I turn the knobs as well as the reverb on/off swith and I don't get any wet signal. Any ideas on how to fix this issue?
Answers (1)
MichaelT
Staff Member
November 12th, 2019
We have a troubleshooting guide above in the Product Files: The Wave - Troubleshooting Supplement. If you send the DC measurements from the guide to info@modkitsdiy.com we'd be happy to help out.
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