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Post subject: DRRI background reverb
Posted: Tue Jan 01, 2013 5:45 am
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Hi, don't know if this has always been the case with my amp but yesterday I noticed some slight reverb in the background even though I have reverb disabled on the pedal and on the dial. Is this normal is something not right?


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Post subject: Re: DRRI background reverb
Posted: Tue Jan 01, 2013 6:49 am
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Slight reverb? Are you sure that it's really reverb from the amp, and not from the guitar, possibly the trem springs? The foot pedal reverb switch grounds out the reverb signal completely, so unless your pedal or cable or jack is defective, you might be hearing something else. :idea:

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Post subject: Re: DRRI background reverb
Posted: Tue Jan 01, 2013 9:10 am
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Have tried it with an acoustic and it's definitely coming from the amp. It's very quiet, even more quiet than on minimum reverb setting. I have modded my amp so that channel 1 gets reverb and vibrato, cannot find the link to the mod but it involved soldering a wire between two places on the PCB. Maybe that is what's causing it although I don't remember having any slight reverb before, could it be the reverb tube is on it's way out or becoming microphonic?


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Post subject: Re: DRRI background reverb
Posted: Tue Jan 01, 2013 9:21 am
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Here is the mod I did on my amp http://www.fenderforum.com/userphotos/i ... ecid=48201


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Post subject: Re: DRRI background reverb
Posted: Tue Jan 01, 2013 10:26 am
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Rich, you have the amp about 4-5 feet ftom a wall? That may add a touch of delay of the the rear facing tone off the speakers from the front.

Try this. TEMPORARILY cover the back of the amp. "Reverb" now gone?

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Post subject: Re: DRRI background reverb
Posted: Tue Jan 01, 2013 12:32 pm
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Helo,
You can also try unplugging the reverb tank to see if its eliminated. If not eliminated then you know its natural reverb occuring from the room your in. If it is elimnated then you know you have reverb possibly leaking in.

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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 5:48 am
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Hi didn't get notifications, anyhow it's definitely coming from the amp because I'm using an isolation box which gives a totally dry signal. I have been testing some more, I tried taking the 3rd reverb tube out and this did seem to get rid of the reverb but it's most likely still there slightly, just not amplified by the tube. I then put a tube back in channel 2 and the reverb is on channel 2 as well.

It seems like the reverb signal is leaking into the dry signal, I don't know how that's possible though. I remember that I didn't do a great soldering job when I did the fritz mod, could a cold solder cause it? The mod is working as intended but I should probably take do it again using my improved soldering skills.

It is hardly noticeable, definitely not noticeable in a mix. If this is the norm and I'm just being picky, well I can live with that. I do have to listen quite hard to hear it, what I do is just pluck a string and mute it quickly, there is a slight reverb trail after it. I'd appreciate it if any of you can try it.


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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 10:19 am
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I performed the Fritz mod on my DRRI some years back and experienced none of the symptoms you've described. Try checking your soldering job and re-flow any wonky-looking joints. Lead dress may also be an issue -- how long is your jumper wire?

Arjay

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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 12:30 pm
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Retroverbial wrote:
I performed the Fritz mod on my DRRI some years back and experienced none of the symptoms you've described. Try checking your soldering job and re-flow any wonky-looking joints. Lead dress may also be an issue -- how long is your jumper wire?

Arjay


Yes I'm going to have a look at it again. The wire is at 45' as I used the shortest length possible so I could cut a new wire, run it along the edge of the PCB and then straight up to solder point.


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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 12:45 pm
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45 feet of wire?! :shock: 45' means 45 feet. :lol:

I suppose you mean a 45 degree angle, but the shortest length possible would be straight from one point to the other, not bent and run along the edge of the circuit board. That could be where you're getting the bleed, running along the edge of the circuit board. :wink:

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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 1:05 pm
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shimmilou wrote:
That could be where you're getting the bleed, running along the edge of the circuit board. :wink:


+1

Parallel runs between certain adjacent traces (or wires) should be avoided if/when possible.

Arjay

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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 2:28 pm
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No it's already at 45 degrees straight as the crow flies. Was wondering if I should do a 90 degree bend to avoid lead dress. Cheers for your help, much appreciated.


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Post subject: Re: DRRI background reverb
Posted: Wed Jan 02, 2013 2:43 pm
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I followed Fred's instructions to the letter. Here's the pic of his modded PCB with the jumper wire in place (mine is the same)......

http://www.fenderforum.com/userphotos/i ... ecid=64923

HTH

Arjay

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Post subject: Re: DRRI background reverb
Posted: Thu Jan 03, 2013 7:44 am
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I drained the caps, took the chasis out and redid the Fritz mod. The original job I did was pretty bad but worked nonetheless. Also I used really thick wire, am using standard guitar guage wire now. Also did a much better job of soldering thanks to a handy tip I picked up of using blu-tak to hold the wire in place.

Alas it made no difference at all. Are you sure you don't get this on your amps? What else could be causing it? I will try a 12AU7 for the reverb later.

At volume, the room reverb is louder than the tiny bit of reverb the amp is making. It also sounds totally dry when I'm playing, I can only hear it when I really listen for it and pluck a string.


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Post subject: Re: DRRI background reverb
Posted: Thu Jan 03, 2013 4:26 pm
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Have you tried to undo the mod to see if still occurs? Then you can be 100% sure that it is related to the mod and not an amp issue.

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