BB Preamp/Glitterattii Clipping Question

[Rich_S]

This is really more of a question for freestompoxes.org, but I've been through their old BB Preamp thread several times, and it's a big long mess, full of contradictions and busted image links.  I'm hoping I can get a straight answer here, rather than scraping the goop off for a look-see.

What I want to know is, what clipping diodes are used in the original BB Preamp?  Is it just a single 1N4148 in each direction, or does it use two 1N4148 in each direction?

I'm considering modding a BB with an SD-1 style asymmetrical clipping section, but want to know what's actually in there first.

Thanks all.