Obsidian-Vulcan-Blackfire differences?

[aron]

Vulcan:

http://www.diystompboxes.com/pedals/sounds/Vulcan.mp3

Obsidian:

http://www.diystompboxes.com/pedals/sounds/obsidian.mp3

[WGTP]

IIRC the 2 stage Blackfire had so much gain that wiring it to the by-pass switch caused oscillation problems, so he added a third stage so that the output would be out-of-phase with the input.

With the Mosfet Obsidians, he discovered that the P-channel BS250 was an order of magnitude quieter than the N-channel 2N7000/BS170's.  Also that the BS250 was less in need of the LED's for protection.   

[aron]

The Obsidian I built was the mosfet version.

[WGTP]

I built the BS250 version and had it on breadboard on top my amp and didn't notice it being any different than the Blackfire or Vulcan, noise wise.