BOSS DD-7 Hum/Noise Wierd Problem

Jovan

Jovan

New member
When I plug guitar to the BOSS DD-7 and to the amp (Laney GH50L) in front I am getting increase in noise regardless is it engaged or not (it increase noise just for being in signal chain, on battery or adapter, the same problem) but when I put it in FX Loop of amp noise dissapears. Is this normal behaviour or not?
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Jovan said:
When I plug guitar to the BOSS DD-7 and to the amp (Laney GH50L) in front I am getting increase in noise regardless is it engaged or not (it increase noise just for being in signal chain, on battery or adapter, the same problem) but when I put it in FX Loop of amp noise dissapears. Is this normal behaviour or not?
Click to expand...

i've noticed this with cheaper digital delays but i thought the Boss wouldn't do that... My DOD's make a blipping sound in front of the amp but not in the loop!
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

This one just increase noise, works proper besides that. Thing is that I don't have one more DD-7 to test is this particular pedal the problem. Hm... whats different in fx loop that could negates the hum as its not noisey at all in the loop?
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

My Boss DD7 into my GH50L doesn't do this. Thats into the front of the amp.
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Hmmm then DD-7 is somehow "mailfunctioning". I have tested this like putted gain up and engaged drive to have a lot of distortion in signal so to hear difference and its noticable when I put DD-7 in front. Also I have tested cables and all cables are okay so only problem can be DD-7, but again which is putting me to think is why its not noisy in fx loop...
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

i had a tech tell me FX Loops are buffered for effects like Delays and stuff .... and plugging pedals into the front of amps can increase noise in pedals that have lower quality Audio parts... as good as Boss pedals all they still have lesser quality parts then what could be used...
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Okay, I will try to find one more DD-7 to test to see will same happend, as I wanna get it (or similar pedal) for delay. I will use it in parallel loop as I am using amps overdrive just don't wanna get pedal that "isn't" working properly so I need to test this thing. Any other delay pedal that you can recommend me? Also I am hunting for chorus so its a bit off topic but if somebody has some nice experience with some particular pedals write it here. Tnx!!
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Putting it in front of the amp does not increase the noise, it just makes it more audible. Since there are more gain stages from the front input, it amplifies the noise more than the loop Iwhich is in the middle of the amp, and therefore operates with a higher signal level.) The technical term is "signal/noise ratio".

So, chances are your DD-7 is making noise all the time, not just when it's plugged into the front of the amp. Try a different one and see if it's the same way.
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Hmmm I must find one more pedal to make test. Its wierd as its the only pedal that just for being in signal chain (regardless are they actualy on or off) in front of amp is increasing the noise, none of my other pedals do that. Do you guys have some recommendation for some other delay? I don't need any fancy things like tap tempo etc, just good old plain basic delay?
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Possibility #1 - Level mismatch between the pedal's output impedance and the amp's input impedance.
Possibility #2 - Duff cable between the pedal's output in the amp's input.
Possibility #3 - Shielding problem.

Some cables, such as the Planet Waves Custom Series, only have the braided shielding screen connected to the jack plug at one end. If you use more than one of these cables in your signal path to the amplifier, only the shielding of the last cable into the amplifier is properly connected to ground. Test with another cable.
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

#1 - Pedal's output impedance is 1k ohm, amp's input impedance is 1M ohm
#2 - Cables are Klotz and they are allright as I have tried to put various other pedals between them and no problems occured
#3 - Everything is properly shielded (except that something maybe in pedal isn't allright)

Ahh :( ...
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

Logically, if the noise is present when the pedal is between the guitar and the amplifier but absent when the pedal is between the Laney's pre-amp and power amp stages, suspicion has to fall on the pre-amp stage(s) of the Laney rather than the Boss pedal.

Do you have access to any replacement ECC83, 12AX7 or 7025 pre-amp valves? (Ideally, valves made somewhere other than China.) I suggest performing an A/B valve comparison test. Find out whether the noise problem is still as bad.
 
Re: BOSS DD-7 Hum/Noise Wierd Problem

The whole amp is retubed with JJ's and this delay is the only pedal that makes noise, whatever that I have putted in front like, Ibanez Tube Screamer, BOSS SD-1, BOSS CH-1 etc. nothing didn't increase noise just becase its in the chain, when engaged they put some noise (depends on situation), that is why I am confused :(
 
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