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Author Topic: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod  (Read 18373 times)

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bunkyloo

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #165 on: Time Format »

cool possibly I will work on it today. Kinda funny because I almost added the MDRT but something told me to wait and see what the noise ad SS mod sounded like. Cant wait to see.
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Iperfungus

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #166 on: Time Format »

Well, MDRT gives a nice kick in the ass to tubes...it makes the overall tone more open and bright, less compressed than with original tranny.
That's a matter of tastes, of course.
I loved original MP-1 tones, but I like a lot how it sounds now with MDRT...it has a lot of punch and it doesn't loose too much on creaminess.
MDRT is a nice improvement, no doubts.

Furthermore, we're not 100% sure that the issue debated in this thread would affect any unit with SS mod, noise mod and MDRT.
We know that at least 2-3 units with same mods have similar, unpredictable, strange behaviors...and we're doing an attempt to go deeper into.
Let's see: as always, every contribution can help!
« Last Edit: Time Format by Iperfungus »
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hansgraudal

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #167 on: Time Format »

...This evening I was talking to a dear friend who's a guitar player and a smart DIYer and electronic tech.
I don't remember how, we ended up talking about my modified MP-1 and I said that I still have to swap R17 to a 560K resistor as MJMP suggested a while ago (yes, I'm lazy...  :homer:).
The conversation took an interesting turn when I mentioned the MDRT mod and the new 190V (EDIT: it's 240V) voltage now going to the tubes.
Ricky made an interesting hypothesis about high radio frequencies coming from external environment, going into ADA through the guitar's pickups and being now amplified by 190V (EDIT: it's 240V) powered tubes (this could explain why there were no squeal before mods).
That made sense to me, because:

1) when no guitar is plugged: no squeal
2) when guitar is plugged with volume turned to 0: no squeal
3) when guitar is plugged and volume's fully open: squeal

So, Ricky suggested something from a video he watched: an input filter placed among cable's jack and MP-1 input.
A 68K resistor placed between signal wire and cable jack and 1M resistor placed among signal and ground wires.
I said "ok, I'll do an attempt ASAP".

Then, an idea came to my brain.
I just took my Boss DS-1 (powered and off) and placed it between guitar and MP-1's input: the squeal is gone!
I can now turn Output Volume to max with OD1 = OD2 = 10.0 and set my preferred eq and there's no squeal at all.
Simply no squeal anymore.

The Boss has some magic inside: a buffer.
Simply putting a buffer among guitar and MP-1 is enough to get rid of that squeal: signal is less sensitive to external noise.
No noise is going into ADA through pickups, no noise to be amplified.

I've done this with another pedal (a Klon Centaur clone) that has a good buffer and result is the same: the squeal is 100% gone.

When I remove the buffer, the squeal is there again unmodified.
...
I'm so happy i saw this! I'll try the same on my unit, and see if the results are the same. If so I'll happily try to develop and share a DIY input buffer project for the MP-1  :thumb-up:
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Iperfungus

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #168 on: Time Format »

I'm so happy i saw this! I'll try the same on my unit, and see if the results are the same. If so I'll happily try to develop and share a DIY input buffer project for the MP-1  :thumb-up:

Please, let us know how it will proceed.
At the moment, I managed to fix the squeal issue with the usage of an external buffer, as I wrote (a TC Electronic Bonafide is doing its job right now, but the Boss or the Klon-e did exactly the same).
This is just a workaround, but for some reason it works very well.

Let's keep in touch!  :thumb-up:
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Iperfungus

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Re: Herby's attemt @ SS Mod, Noise Mod, MDRT Mod
« Reply #169 on: Time Format »

Hi folks!

Has anyone already tried the alternative buffer solution?
Any other news?

I will do another attempt and let you know, meanwhile.
« Last Edit: Time Format by Iperfungus »
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