Has anyone done a side by side with the Rebote 2 and Rebote 2.5?

[skiraly017]

Just curious about the sonic differences if any. Thanks.

[jonathan perez]

+1 

[oldrocker]

I have done a comparison of the first Rebote with the 2.5 version.  I was really surprised how nice the first Rebote actually sounds.  Very clean repeats and even though the delays aren't as long they're still fairly decent with no noise.  Of course there's no blend pot.   I haven't tried version 2 yet so if I find time I'll build that one up.  I highly recommend the first Rebote ciruit based off of the Princeton datasheet.  If you're needing a nice echo delay that's easy to build (built it on perf no layout) then give it a try.

[blanik]

i'm under the impression that the evolution of the Rebote, 2, 2.5 is about trading high-end for longer delay times... so i would assume that someone looking for long Pink Floydian delay would be better with the 2.5 as opposed to someone looking for a simple clear slapback might prefer the rebote 2...

i think it's time for Mr Pena to awnser this tread! 

R.

[Fp-www.Tonepad.com]

Hi, I actually built both circuits and thought they sounded very close on the first repeat at least.

In the rebote2.5 there is a more abrupt treble cut so it becomes more noticeable with each repeat, not so much on the rebote2, which has a softer filter.

My rebote2 is out of service because it became a rebote2.5 with a lot of hanging wires and parts, but having both built and working is in my to do list.

Fp

[jonathan perez]

very good! very good information, thanx folks!

i heard of a mod on this to shorten the delay down to chorus times...am i correct on this, or was that too a dream?

[Fuzzy-Train]

Can you mod the 2.5 to get oscillating feedback? Would I just have to increase the value of the pots, or change some components?

Would be a cool feature to have on this bad boy.

[sfr]

Been a while since I A/B'd em, but yeah, the Rebote has more of that analogy-delay sound where the repeats loose more treble as they continue on.  2.5 could get the oscillating thing fine, but had a harder time controlling it than I did the 2, but this may just be because I had the 2 for much longer.    Noise floor seemed lower on the 2.5, (until I started running wires everywhere for mods)

PT-80 sounds the most "organic" of the three DIY delays I've tried, but sounds a little wierd with more repeats.   Volume, and number of repeats controls seem a little more intertwined, and it seems more sensitive to the input level than either of the rebotes.  (I.E., pick harder and you get a little more delay, you will get a heck of a lot more repeats out of the thing if you turn your booster on in front.)  Either a good a or bad thing depending on how look at it - it's sort of very responsive to your playing in a way, I guess.  Stock, the first repeat is quieter than the subsequent ones, like my Rebote 2.5 and unlike my Rebote 2.  This changes with a booster in front. 

All three sound a little dirtier with longer delay times, but not too noticable playing with a band.  The Rebote 2 was the worst in this aspect.   I put switches to extend the delay times even longer than stock on my PT-80 and Rebote 2.5 (basically double the repeat rate?) with these switched, the Pt-80 sounds more natural for the first couple of repeats, after that the Rebote 2.5 sounds more natural. 

The PT-80 at more number of repeats, it the echo begins to break down into almost white noise, where the Rebote doesn't really do this.  I don't know if this is a problem with my build, or from sending the audio signal through the compander chip or what.  It sounds really cool if you get it set so it's subtle.  The Rebote decays to noise just as well, but the noise is different.  I'll try to get some soundclips up later.  But this tends to make the Rebotes better for self-oscilllating and playing with the rate knob and fun noise experiments where you get something in there and then cut the input signal.

[blanik]

is it possible to change the filtering ection of the 2.5 to have the repeats slightly brighter without affecting the delay time? (even if it means a dirty signal on longest delays)

[Fuzzy-Train]

2.5 could get the oscillating thing fine, but had a harder time controlling it than I did the 2, but this may just be because I had the 2 for much longer.    Noise floor seemed lower on the 2.5, (until I started running wires everywhere for mods)

Really? I have the infinite repeats mod in as well and I can't get any oscillating feedback at all... barely get infinite reapeats for that matter. Something might be fishy in my rebote.

This is what I/you mean by oscillating feedback right?

starts at about 2:08.
http://youtube.com/watch?v=K1Nx6OUWuOQ

[sfr]

To get iI'm at work, so no speakers, so the video link does me little good right now - I'll ret and remember to check at home.  To get self-oscillation, turn the volume and number of repeats all the way up, and turn the delay time all the way down.  It starts pretty quickly on it's own for me on one build, on the other I've got it set just at the brink of disaster, so I actually have to feed it a note or some noise to get it going.  (The noise can be simple as line noise from having a distortion pedal on in the chain.)

[Fuzzy-Train]

I just tried that and it didn't work, and even with everything maxed I get no oscillation either.

Hmmm... I wonder what the problem is???

[blanik]

I just tried that and it didn't work, and even with everything maxed I get no oscillation either.

Hmmm... I wonder what the problem is???

you actually have to generate a note or sound from your guitar... if you just turn the knobs without feeding a signal into the pedal it won't work... 

[sfr]

With mine, with the repeats and volume turned all the way up (actually, just the repeats I believe on the Rebotes - the PT-80 seems to like them both turned up) and the delay time turned all the way down, I get self-oscillation with no input, the same noise that starts about 2:29 on the youtube clip posted above.  Of course, I've got enough wiring bouncing around for mods on mine that it may be the line noise it picks up it causing this to happen, but I feel like there's a point where you get self-oscillation regardless of input.

[slacker]

When I first built my rebote 2.5 it wouldn't feedback and I couldn't even get endless repeats out of it. After a lot of debugging it turned out I'd swapped the positions of the 47k and 12k resistors attached to pins 15 and 16 of the pt2399, this reduced the gain of that stage so the repeats couldn't build up. Might be worth checking those resistors if yours won't feedback.
Now mine gets endless repeats at about 3-4 o'clock and above that it will gradually build into feedback.
With the repeats on full it will feedback on its own with no input if you set the delay pot to minimum. At longer delay times with the repeat pot maxed it will build into feedback if you feed it a signal but won't do it on its own.
This is using the suggested 10k for the "red resistor", the only thing I've done that might help is to use a 47k pot for the repeats pot because I didn't have any 22k pots, but I doubt this makes any difference.

[Fuzzy-Train]

I tested it on my 10w SS amp, and it feeds back a little bit, but not nearly what's demonstrated in the video.. and my amp has to be pretty loud as well. I actually didn't put this one together myself and while looking at the resistors mentioned above me by slacker I looked at the other parts. I found these subs:

Both 510k's subbed with 570k's (probably the problem)
240k subbed with 220k
33k subbed with 10k (I think this might be the problem)
51pf subbed with 47pf

I'll swap the 10k for a 33k a little later on tonight and see if it works.

[Fuzzy-Train]

Tried that last night with no change. Didn't seem to effect the sound or anything either.

Meh... it's no biggie, but it would be cool to get that effect.

[slacker]

Have you tried reducing the value of the "red resistor"? Try shorting it out or replacing it with a jumper, if it still won't feedback you probably need to check your pot wiring and cap values. It could be that one of the caps in the filters is too big and that's rolling off too much signal.

[Fuzzy-Train]

All the caps are right... some are really high voltage caps, bu that shouldn't be a problem should it? All the wires are where they should be and the values are correct.

just in case pic:

the 10k above the op-amp was changed to 33k though... old pic.

I already have that repeat resistor at 10k, but I'll try and lower it after dinner.

[Fuzzy-Train]

Success!! Worked wonderfully... thanks a lot man. I used a 4.7k resistor cause the 8.2k didn't work very well and that was the only other value I had. I tried a 1k but that was just overboard.

I think when I re-house this bad boy I may add a switch to choose between some resistors.

Thanks again for the help, and sorry for de-railing this thread slightly... but it could prove usefull to someone else later on.