ADA Depot - A Forum To Support Users of ADA Amplification Gear

ADA Preamps => MP-2 => Topic started by: mikeskory on April 13, 2017, 08:14:32 AM

Title: ADA MP2 Noise mods
Post by: mikeskory on April 13, 2017, 08:14:32 AM

4/13/2017  I'm doing the 1st of 2 mods on the MP2.  http://adadepot.com/mods/MP-2-NoiseMod.pdf

Doing the R913, C333 etc area now.  Can anyone confirm that this woks to eliminate the "squeel"? :banana-guitar:

Title: Re: ADA MP2 Noise mods
Post by: rnolan on April 13, 2017, 07:44:23 PM

Hey mikeskory, in many cases it does fix the squeal, but as I posted before, depends what's causing it.  But it will definitely help reduce noise and not hurt anything to do it.  Did you measure the test point first ?

Title: Re: ADA MP2 Noise mods
Post by: Harley Hexxe on April 15, 2017, 01:56:41 AM

Good point Richard!

    Maybe try swapping the tubes positions in the MP-2 first. If the V1 is pushing harder than V2, that can cause a squeal in high gain settings.

Title: Re: ADA MP2 Noise mods
Post by: rnolan on April 20, 2017, 01:55:08 AM

Good advice Harley  :thumb-up: Also as posted before (in previous thread) check your input jack, it is often the culprit and they ware out (this is worth doing regardless), remember to check the thread length, the MP-2 jack is longer thread than standard jack

Title: Re: ADA MP2 Noise mods
Post by: MarshallJMP on April 20, 2017, 01:48:59 PM

If it's the jack then the squeel only happends when nothing is plugged in.