Microphonic Russian Big Muff

[mosrite1]

Hi All

I have a Russian Black Big Muff. It has 2 problems

1.   While the effect is on, you can tap on the casing and you can hear it loud and clear. I replaced both jacks, and it still does it . I have another Russian black big muff that is a few years older and it is quite. I can tell that the casings are different, the older one is a bit bigger and the finish is different too, the newer one is a flat black, and the older one is more glossy. Is this a common problem ? Would shielding it with copper tape  help ?

2.   When the switch is engaged it makes a pop. I also just replaced the switch with a 3PDT and it is still noisy. The older Russian Muff is really quite....What gives ?


thanks

[Phorhas]

About 2 - does it have pull-down resistors?

If not - use 1M resistors on the input, this should help with pops

[mosrite1]

Use the 1M resistor on the input of the 3DPTswitch ?

[Phorhas]

Yup, just make sure it's connected to the FX's input and not the input jack - so that the input cap always sees the ground through the resistors.

[sta63bmx]

Both Microamps I built in powdercoated boxes popped a little when I tapped on them.  In my case it turned out that the jacks weren't holding the cord ends tightly enough, and it was breaking the ground connection every time it got hit hard.  I bent the jacks to hold the plug a little more tightly.    I would also check your ground solder connections.  I've had some popping issues that were a cold solder joint acting up, and every time the switch clicked, it was a sharp enough vibration to make it click.  FWIW, my ground connection click/pop issues have always sounded like a sharp "tick" or crackle noise, and my ground level/switching noises are more of a lower-frequency "pop" that has more bass and hits the speakers hard.

[doug deeper]

my old sovtek muff is micrphonic as is the clone i just built.

[mosrite1]

How do I find the effect in to put the 1meg resistor in  ?

[343 Salty Beans]

I don't have your pedal, but it should be the spot where your input jack runs to the footswitch, then the footswitch runs to the board from the same set of poles. Just use a 1 meg resistor from the effect input to ground.

Take the bazz fuss, for example:



The pink wire is the input connection. you'd use a 1 meg pulldown resistor (I put it on the board itself, right after the effect input) from the effect input to ground. Put one on the output, too.

If you don't understand, go to the tonepad tremulus lune PDF http://tonepad.com/getFile.asp?id=84 and look at the PCB layout. The 1M resistors are pretty obvious and go to the green (ground) trace on the circuit board, right next to the input and outputs on the PCB.

[mosrite1]

I found the microphonic problem. It was some resistors on the board that were not quite soldered right by the factory, I re soldered them and now it works great . I did the 1m resistor on the switch, and that worked like a charm for the popping

thanks to everyone who helped

[aron]

It was some resistors on the board that were not quite soldered right by the factory,

WOW. Amazing. I would have never guessed.