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Author Topic: MarshallJMP Noise Mod  (Read 13538 times)

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El Chiguete

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MarshallJMP Noise Mod
« on: Time Format »

Any of you guys have a before and after audio of the noise mod of MarshallJMP? I want to see just how much it works and to see if I need it or not.
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El Chiguete

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Re: MarshallJMP Noise Mod
« Reply #1 on: Time Format »

Here you can watch and hear the noise http://www.youtube.com/watch?v=UfEfvXF83DQ&feature=youtu.be (sorry for the audio lag). Any idea what type of noise it is?
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El Chiguete

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Re: MarshallJMP Noise Mod
« Reply #2 on: Time Format »

Or this ¨noise¨ is just something that you have to deal by cropping the recording and using plugins in your DAW?
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GuitarBuilder

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Re: MarshallJMP Noise Mod
« Reply #3 on: Time Format »

That sure sounds like AC hum to me......

Have you replaced any of the power supply capacitors?
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El Chiguete

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Re: MarshallJMP Noise Mod
« Reply #4 on: Time Format »

No, I haven't replaced anthing on it, maybe there is a list of parts that should be replace for a general maintenance for a 2o year old unit?
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'87 Kramer Stagemaster Custom
'81 Kramer Pacer Standard
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ADA MP1
Rane MPE 28
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trader144

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Re: MarshallJMP Noise Mod
« Reply #5 on: Time Format »

Can someone post a clip of an mp-1 with the noise mod so we can compare?

Just crank the preamp and the amp and hit record; don't play.

I am dealing with the same issue and this sounds like standard tube gain. I would like to reduce it but when comparing tube amps and YouTube videos I am thinking that it is a necessary evil and a a noise mod might get rid of 25%, but even a 5150 head newer tube amp seems to still have this noise when cranked.

There is one guy on here who said his noise mod was extremely quiet, but I am comparing to solid state quietness.

I am wondering if a noise gate is the only solution for silence.

Thanks in advance.
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h.e.l.shane

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Re: MarshallJMP Noise Mod
« Reply #6 on: Time Format »

I dont have a clip...  But i did the noise mod to mine..  And it was stupid quite!!!  I mean that quite that guys swore it was solid state
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trader144

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Re: MarshallJMP Noise Mod
« Reply #7 on: Time Format »

Thanks I needed to hear this
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Guitars: Malmsteen strat, Fender '62 reissue
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El Chiguete

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Re: MarshallJMP Noise Mod
« Reply #8 on: Time Format »

I dont have a clip...  But i did the noise mod to mine..  And it was stupid quite!!!  I mean that quite that guys swore it was solid state

Which noise mod did you do? and what did you change?
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Before you see the light, you must die!!!

'87 Kramer Stagemaster Custom
'81 Kramer Pacer Standard
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ADA MP1
Rane MPE 28
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Epiphone Valve Jr. moded!!!

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trader144

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Re: MarshallJMP Noise Mod
« Reply #9 on: Time Format »

Does a new transformer (MDRT or stock) help reduce ground loop noise?

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rnolan

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Re: MarshallJMP Noise Mod
« Reply #10 on: Time Format »

Reducing ground loops is tricky it's related to what and where you plug stuff in to the power, basic, plug all into same power point.
MDRT gives you benefits apart from being 240/115 v friendly, better heater volts etc
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Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s

trader144

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Re: MarshallJMP Noise Mod
« Reply #11 on: Time Format »

Thanks
I asked the wrong question sorry
What I meant to ask is: do the old mp-1 transformers contribute to the noise we hear in the outputs?

On ground loop noise, you provided some good advice earlier and I had good results with the Ebtech ground loop bug.
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rnolan

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Re: MarshallJMP Noise Mod
« Reply #12 on: Time Format »

Absolutely, every component in a circuit adds noise, my understanding is the MDRT adds less noise than the original tanny MJMP will know better why (my guess (partly from pics of them) is coz it's 2 trannys in one but separated ?) so rather than the various taps off the coil all in one. Not that I'm an expert in transformer design but wrapping more coils of copper around where the inner taps come out must have some effect.
Also the tranny "is" the signal in that it provides the Eddy electrons into the circuit(s) that go on to make/amplify the guitar signal.  This then becomes a gain structure conversation.  When you add gain, it boosts the signal and the noise.  The better the signal to noise ratio of each component, the less noise is boosted along with the signal for the same output. So the idea is to have as much signal as the component(s) in the circuit will take without clipping/distorting and stay as far away from the "noise floor" as you can. A lot of noise can be reduced by just getting your gain structure right/optimal.
However, when you exacerbate the situation by using tubes to create distortion (not the original intention of a tube BTW) which is basically overloading/clipping/compressing each gain stage (2 in each 12AX7 so 4 in all, or 6 in 3TM), the noise is boosted even more compared to the signal (it (the noise) is not clipping/compressing, just getting boosted/gain).  So the lower the noise floor of each component, the better.  Various components that do much the same thing in the circuit can have very different signal to noise ratios/noise floors (for a various reasons). Generally better S/N components cost more.  There's an interesting post on here somewhere where he swapped out all the opp amps in his MP1 selecting only the best he could source (freq response/noise floor).  Reported result was amaizing reduction in noise and total opening up of the sound.
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Sparker

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Re: MarshallJMP Noise Mod
« Reply #13 on: Time Format »

Ok, my 2c:

1. "my understanding is the MDRT adds less noise than the original tanny"

The MDRT transformer will not add any less noise than the original ADA transformer.
It will, however deliver more current and higher voltage (which are good) than the original ADA transformer.

2. "Also the tranny "is" the signal in that it provides the Eddy electrons into the circuit(s)
that go on to make/amplify the guitar signal.  This then becomes a gain structure conversation".

Each output from the power transformer (whichever one) is rectified, filtered and regulated (where needed) to remove power
line noise, so as not to play any part in inducing "bad stuff" into the signal amplification chain.
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rnolan

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Re: MarshallJMP Noise Mod
« Reply #14 on: Time Format »

1. "my understanding is the MDRT adds less noise than the original tanny"
The MDRT transformer will not add any less noise than the original ADA transformer.
It will, however deliver more current and higher voltage (which are good) than the original ADA transformer.
So better signal to noise ratio ??
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Studio Rig: MP2/MB1 > Eurorack UB2442FX-Pro > TC M-One XL > Behringer Truths (with Truth Sub) / QUAD ESL 63s
Live Rig: MP2/MB1 > Alesis Quadverb > Alesis Midiverb 4 > Yamaha AM802 > B200s/Carvin TS100/DCM200L > ADA Split Stacks/Mesa P112s
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