Greetings all,

I'm working on another build with dual springs along the thru body neck inside the box for reverb effect.  My last build didn't seem to generate that much effect from the springs, so I thought I would turn to the collective think tank for some thoughts.

What size spring works best?

What tension? (tight or loose?)

Spring material make a difference?

Thanks in advance for all the wisdom.  You all are awesome!!!

Poppabear

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I like the one you built with the piezo on the spring.

Regular guitars with tremolo's have a different tone than the ones with the hardtail bridge(I.E. Strat vs Tele) because the vibrations from the strings carried through the body and hardware and being transferred to signal by the pickups.

Your version in your guitar is a more intense reverb effect while the other method is more reserved. I have a reverb effect that I started working on using springs in a metal chamber(heating element box from a old clothes dryer) that will offer spring reverb and echo effects using piezo's like your guitar is done. Hearing yous makes me want to hurry up on that effect. So much to do and so little time.

Hi, I found an old spring in my scrap bits drawer so decided to experiment, I used an unfinished CBG I have on the bench. The spring is about 10-12mm diameter and about 200mm long.

I have it mounted in the box so that I can find out what excites it, and how much effort it takes to put the spring in motion.

Of course the spring has no musical sound when plucked or tapped free of any mounting, but as soon as it was mounted in the box it emitted a audible sound when picked or tapped. Next step.

i need to test how easy it is to excite the spring without touching it. This is possibly all overdoing it for a simple instrument, but I enjoy the challenges.

The spring is adjustable, I can vary the tension, this will allow me to test it's responsiveness to the exciting source. As when tuning the top and back of an acoustic guitar for for optimal output, I'm thinking that tuning the spring to work in conjunction with top and back vibrations and air movement will be beneficial.

So far I've found that exciting the spring whilst varying the tension does have an effect on the springs vibrating intesity and sustain. I've also designed a damping system so as to have an"on/off switch".

Taff

That's fantastic Taffy, great experimentation and I know you had fun doing it.

The on/off part made me think of the Duesenberg Guitars Resobro bridge system, it can be turned on/off by pushing 2 screws on the bridge posts(tunomatic style bridge). Andries posted a video about how it works in his "What Your Holy Grail Guitar" thread.

I am also thinking of lining the inside of the sound box with sheet tin. that may help in bouncing the vibrations. Also want to try this for the reso i am building...

Hi, my thinking is you could be inhibiting vibrations rather than increasing them, with a tin barrier installed in the box. 

I suggest finding out what excites the spring into motion and improve that. That's what I have done. I'll share more later. Because we all build guitars differently, there will be different results for different guitars/builders.

Taff

Hey Mikey, As I mentioned above your post, the Resobro guitar uses a blade from a putty knife under the bridge and stop tail piece to make reso sounds. Might get some ideas from that.

There was a video that Shane did awhile back of using metal yard rake tines mounted inside the box for a echo reverb effect.

Hi, I'm learning a lot with this spring thing.

By stretching the spring to open the coils, so they stay open when the spring is no longer stretched, I think makes the spring more responsive'

My spring is easily set into motion by the gentle tapping of  the back and/or sides [top not on yet]. 

Adding timber to the inside of the box to replicate a neck trough system killed the effect of the spring by about 50%.

I have cut out an access panel into the back so as to be able to make adjustments.

I have also started on the spring damping system

And just for even more "overkill" I'm gonna try to tune the spring to suit the resonant frequency of the box.

Taff

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