Spring reverb

[hpdonat]

Does anyone know where I can find a replacement spring for this reverb tank I found? If so, what do I need to consider when I buy one?

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[PRR]

Springs don't break. So they are not stocked as replacement parts.

If the cat has stretched that spring that far, the transducer may also be broken.

If you have to fix the amp, buy a new tank. (Good luck: that does not look like any common tank.)

The reverb will "work" on one spring, just not as "rich". Single-spring reverbs are so-so rare that I suspect it will be disappointing.

If you must fiddle this one: you can try light thread to bunch-up the sprung spring coils and get it back to semi-tension. Added mass is bad. Bound coils are just dead weight. So it still won't be what it was.

Wild idea: take the guts out and put in a larger enclosure. Stretch the good spring to match the sprung spring. It may play. It may sound like 6 inches of spring in a 24 inch box.

Spring tanks are not THAT expensive. MOD has a "value" line which will real-reverb for not a lot of bucks.

[thermionix]

Yeah your best bet is to try and find a more common equivalent.  You'll need the input and output impedances, as required by the circuit is goes in.  You might have to change the circuit somewhat to make it work with an available replacement.  What is the tank?

[Rob Strand]

You could try to pinch the widely spread part together. 
You need to do it with something extremely light weight and stiff.
The tension needs to be similar to the other spring.

Other than that I'm with PRR.

[To replace it  measure the DC resistances at both ends then try to find one with similar DC resistance.
You can get away with just matching the input side, the lower impedance]

[thermionix]

On second look, the code is there, 7EB1E1A.  You need 600 ohm input impedance, 2250 ohm output.

[Rob Strand]

On second look, the code is there, 7EB1E1A.

Well spotted!

[hpdonat]

On second look, the code is there, 7EB1E1A.  You need 600 ohm input impedance, 2250 ohm output.

How did you come up with that?

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[Aph]

Ha! That little reverb brings me back. I built my own version of a pygmy guitar amp and put one of these in for reverb:




It's really tiny and it sounded pretty crappy.
Oh, by the way, you can get the above unit for just $112 on ebay. I think I paid just a few bucks back in the day.

Is that out of a small Peavey amp?

[thermionix]

On second look, the code is there, 7EB1E1A.  You need 600 ohm input impedance, 2250 ohm output.

How did you come up with that?

I was a Reverb Technician in the Merchant Marines, dubya dubya two.  They wouldn't graduate us from A-school if we didn't have the Hammond-Accutronics codes flat memorized.

[EBK]

The code for this one is 666:
https://hackaday.com/2012/11/28/100-meter-spring-reverb-makes-us-hear-satanic-voices/

[Digital Larry]

A guy at a guitar amp company who shall go unnamed wanted to see if I could digitally reproduce the Vinnie Bell "underwater" sound as exemplified here:

https://www.youtube.com/watch?v=Ee73YSrOh2A

Apparently Vinnie Bell invented a lot of his own effects, which he subsequently kept quite close to his chest after having some idea ripped off by some manufacturer without compensation (or so I recall - I can't find any reference to it at the moment though).  http://www.spaceagepop.com/bell.htm

Anyway long story short, I finally came to the conclusion that the Vinnie Bell underwater sound is a spring reverb, possibly a single spring, possibly full wet, possibly being driven really hard, and also possibly having its spring lengthened.   There's a so-called chirp frequency that is characteristic of the spring.  I used Audacity on the Vinnie Bell audio to try to see where that was and it was about 1700 Hz.  This is not normally specified for reverb springs but my general sense is that that is a very low chirp frequency.

I realize this is almost totally off topic, but I'm actually about to get a spring reverb to incorporate into a modular synth system I'm upgrading.  I think it has applications (as noted) as a special effect unto itself, where rather than trying to suppress its un-reverby tendencies, you could seek to magnify them - by loosening or tightening the spring, just using one spring, etc.

Then there's this abomination: https://www.youtube.com/watch?v=hjoHSy_GEbA

[thermionix]

What's a Dubstep?

[Digital Larry]

What's a Dubstep?

Didn't one go into a bar with a Henway?

[thermionix]

Never without a dikfer.

[Digital Larry]

In the interest of actually trying to be helpful, here's one place selling new reverb tanks of many sizes and orientations and impedances.

https://www.tubesandmore.com/products/reverb-tank-mod-4bb3c1d

[Rob Strand]

, here's one place selling new reverb tanks of many sizes and orientations and impedances.

At good prices too by the look of it.

[thermionix]

tubesandmore.com = amplifiedparts.com (= cedist.com with a wholesale account)