@bjf 

Wow thank you for taking the time to given me these suggestions. I think I am gunna try both before the reverb driver and after to see what gets the best result.

I already have a wonderful SBEQ up and running on tag board, and thought I’d try and make this reverb really crazy.

thanks so much, 🙏🏼🙏🏼🙏🏼

best,

peter

Just wanted to chime back in and say that I got this up and running in a custom enclosure with a spring tank inside and it sounds great! 

Originally I planned on using an eq circuit on the wet verb signal. I had a working Sea Blue EQ on vero, but found that before or after didn’t have a dramatic effect on the eq balance of the wet signal. I opted to put the eq right at the front, effecting the dry before it enters the Reverb circuit. The SBEQ just makes stuff sound better. 

Build observation:

According to my instruction booklet I have V1.1 and on this version there is a pcb error  which I finally solved with the help of a comment further up this thread. The effect (at least my version) will not work as-is. It needs a jumper to get T7 to have correct voltages.

the “dwell 2” could easily be fixed at max or near-max. It doesn’t have a huge impact on the sound to my ear. And relative verb balance can be controlled by the Mix knob. 

There’s a good amount of gain on tap via TRM2. I’m thinking about bringing that outboard. It’s handy if you are using this as a special effect and want a little boost when engaged.

I packaged it all up in a very vibey old PA speaker housing. 
Some Photos here: https://reddit.com/r/diypedals/comments/nbucw1/springtone_plus_solid_state_spring_reverb_tank_eq/

thanks for the pointers Bjorn!

-Peter

Hello. I assembled this kit with the spring tank and the delayed switch to ground mod. It is my second build ever (I was very lucky the first time and that worked right away), so I've yet to learn how to best track down issues.

The pedal powers on, the LED lights up when engaged, I get clean sound coming through when bypassed, and can hear spring sounds if I knock the side when engaged. I can also hear clean guitar when engaged. The trim pot inside effects the sound when on as well as the three knobs, to a small degree. And if I tap the side as I engage the switch, the spring noise fades in, so it appears that the mod on the switch works as well.

I tried the jump wire from R18 to R22 mentioned above, but that didn't change anything.

I did make a note of one resistor that might not have been correct while I was putting things together. The instructions and packing list call for R32 = 150k (brown green black orange brown) What I received and installed in its place has the following bands: brown green black orange purple red. After typing that I entered these colors into a resistor calculator and see that this should have the same resistance, so I doubt that is the issue now.

I have a cheap multimeter but almost zero experience using it. Any guidance would be appreciated. Many thanks!

Hi,

I've recently built the universal reverb driver.....it seems to work great, but I find that that dwell 1 keeps a consistent output volume up to 3 o'clock, then decreases in volume after that (as more of the signal goes to the reverb tank).  My tanks have been tested, and this has happened with multiple tanks.  Is that normal?  Any help is greatly appreciated!

Thanks,

Mike

@bjf

see previous comment.....forgot to tag you in the last one. Thanks!

Hi there,

@bjf

Thanks so much for the reply....I appreciate the help.  I checked the voltages of the output on the board (blue wire solder point that says output on the board), and they are the same (.8) regardless of where the knob is set.  To be more specific, the clean guitar volume stays at a consistent level up to 3 o'clock, then as the reverb sound gets louder, the clean guitar volume has a noticeable drop at that point until the end.  Obviously it's getting drenched in reverb as well, but there seems to be a significant drop in gain somewhere at that point.  At first I thought it might have been something to do with the level of reverb coming back in, but it's done the same with multiple tanks.  On closer examination, it's definitely the clean signal of the guitar though--it's at a consistent volume as reverb gets higher, then dips in volume  from 3 to 5 (when the dwell knob is fully turned).  Hope that makes sense. 

Thanks for your help!

Mike

@bjf

I went back to check that reading, and the blue output cable is saying 0 now--must have been touching another component.  

Thanks,

Mike

Hi Mike,

Yes I see and yes connections are tight and next to output is B+ et.c.

That is great to hear that it is now solved

BJ

@bjm

Thanks Bjorn.  Sorry I if wasn't clear...I'm still having the same issue--basically that the output of the pedal drops in volume after 3 o'clock.  All connections are tight. 

Thanks,

Mike

@bjf

Hey Bjorn, I did some more testing of components to see if I can find the problem.  I saw on an earlier post that resting voltage on T1 and the Dwell 1 pot should be about 2V.  Mine is reading 1.46.  Could that be the issue?

Thanks,

Mike

Hi there,

@bjm

Thanks for your reply...yes, still having the same issue with volume loss past 3 oclock on Dwell 1.  I can wire the resistor if you think it will help the problem (though seems like if T1 is readying 1.48 its probably still within allowances).  

Do you think that should fix the volume drop at Dwell 1?  Or could there be something else causing it?  

Just wanted to check before making changes.

Thanks for your time,

Mike

@bjm

I tried adding a 10M ohm resistor, which raised the resting voltage of T1 to 2.7.  The volume loss issue was still present.  

I also noticed that the volume loss occurs whether the reverb tank is attached or not. 

Thanks,

Mike

Hi There Mike

OK I 'll give this deep thought and may have to build a board and see if I can get this

Re J Fet's : no it won't make any audiable difference: basically a common source buffer like this has a a voltage gain less than 1 times but fairly high current gain. This means circuit can convert high impedance to low impedance. A buffer like this one with a a J113 can drive about 2K Ohms without any audiable loss. This function is within the output voltage range independent of the resting voltage. So  raising DC bias a little will not affect voltage gain through the circuit.

At your service

BJ