Bazz Fuss: Transistor swap woes?

[ThunderShowers]

Hola Folks.

I built the Ever Popular Bazz Fuss as seen here But due to Poor Parts selection in my area, had to sub the MPSA13 for a MPSA14. I am now Plagued by A joyful "Boiling Kettle" noise that seems to get worse as the gain knob (Standard Fuzz Face Gain control) Is turned down.

Part of me wants to say it's the Double gain, and part of me wonders on the grounding, or even the Power supply, as I know mine is on its last legs.

I'm using this Switching Layout and the Philip Marshall AC filter (The second DID reduce the noise, so maybe a combination from poor grounds and the added gain?)

If it IS the Transistor, any Fixes, besides getting the proper part?

I'm kind of disappointed in myself here, I built a Random Number Generator Clone nearly flawlessly the day before this.

[superferrite]

If I remember correctly, the MPSA14 is NOT a darlington transistor and needs a 100k resistor instead of a 10k.   It's similar to a 2n5088 in gain.  Try that and see if it helps.
It's more like the older version here:
http://www.home-wrecker.com/bazz.html

[ThunderShowers]

I suppose I should Have linked this in the OP

- But i'll try the 100K Regardless.

[ThunderShowers]

Double post, I know, But Quick Update: 100K Resistor INCREASED noise.

[Earthscum]

I think you are getting "motorboating". Try removing the supply filtering and see if that helps. The large cap and resistor may not be playing nicely with the diode and gain. Also, just try different resistances, probably 4.7k up to 47k from the collector. I was usually digging on 4.7k, 10k, or 22k. 4.7k has more clean-up room than the 22k does, but you can still get a decent variation of fuzz out of the 47k. I never use a gain pot, just emitter to ground, or through a low value resistor (330R or less). I use the emitter resistor to get the gain I want so all I have is a volume pot with a large knob. I play bass, so it makes things easier to kick up when my guitarist gets stupid and the sound guy is grabbing himself another pitcher.  

UPDATE: Yeah, definitely try removing the supply filtering. Also, yeah... I can't tell if you are now using MPSA14 or 13... I use 13. They are, as you discovered, both Darlingtons. (my other choice is BC109 and 2SC1815, neither are Darlington and need increased resistance... I usually hit these with no less than 22k at the collector, up to 470k if ya want the hiss).

[ThunderShowers]

Haha, Thanks for all the Help: A little Fiddling between Schematics to and fro found a Flaw I missed. 

Adding the Fuzzfaces 100K Resistor from after the input cap to the gains First Lug Killed Most the Noise.

As for the Power Supply Filtering Earthscum: I thank you, but it's the Inductor/Cap, it works amazingly. Without it in the line, the noise hits a Level I never want to hear again (This Powersupply is TERRIBLE). It is the MPSA 14 By the way: It was the only one that was close, at double the gain.