Fuzz turns into radio reciever overnight!

[superferrite]

Fired up my board at practice like normal last night and my EasyFace had miraculously turned into an AM reciever!    Nothing else was different than usual, and that pedal (my sole PNP) was BATTERY OPERATED!  It was 80% as loud as my guitar signal...

My buddy's house is pretty loud electrically,but not this bad, and the guitar is shielded fine.   
Why?!?!?
Am I going to have to get or build another fuzz, maybe one powered with the other pedals?

[Davelectro]

Welcome to the painful world of FF-based circuits.

You can try many things but let me tell you those guys are inherently noisy and highly unpredictable in terms of RF interference.

[egasimus]

As anyone round these parts would tell ya, now that you've got a good radio receiver, don't mess with it

[earthtonesaudio]

Yep, stock FFs are AM receivers that just happen to sound good for guitar too.

Normal approach is to limit gain and bandwidth, but this is a fuzz so you want all the gain.  That leaves limiting bandwidth.  You can RC or LC filter going in, add a cap for Miller feedback or a cap in parallel with the feedback resistor.  Alternatively you can put a small inductor (micro Henries) between Q1's emitter and ground.

[deadastronaut]

what station is it?...

[superferrite]

Something Mexican!

Like probably from Mexico for reals!

Thanks guys.   Ugh!

[Quackzed]

fwiw a crappy cord can sometimes do this in an exaggerated way. i've had intemittent cables that will work/not work ,and in front of a fuzz a broken cable can sometimes act like an antenna and amplify the 'radio' effect... maybee a bad cable?

[superferrite]

THAT'S  a thought!  I was using a recently "repaired" specimen that should probably be in the trash heap.

[pinkjimiphoton]

check for funky solder joints near the caps, too, or input  area. sometimes even what looks like a good joint will go bad over time, and suddenly you're on the mexican radio station.

[Quackzed]