This boost has a fairly unique sound - I wanted something a bit more "small Fender" sounding than the Fetzer Valve and figured out that the 2 knob tone stack on the SF champ was what did the trick. This is a very ROG-ish design - note I don't even claim doing anything towards the design of this pedal. What I did is combine a ROG Fetzer Valve (btw read the updated article - it's great!) with the rest of one of my favorite amps - the AA764 champ - using the AA764's tone stack and passive component topology and got this great sounding circuit.

Here's the layout:

Here's the PCB mask (you'll have to shrink this - note the 1" ruler)

How's it sound? Well, great - kind of sounds like you're playing through a champ if you set your amp's eq to be fairly flat with a clean sound - it has a lot of that small fender amp vibe to the sound; nice soft highs, with a bell like tone. What I really like is that since I finished this pedal and started using it (and I use it a lot) I don't feel the need to switch amps to use my Deluxe Reverb to get a Fender sound - this pedal pretty much does that better than anything else I have tried.
Notes:
0) Torchy suggested making R3=3k - I need to add that mod to the above schematic as it sounds better
1) Sw1 works like a boost to overdrive switch - it works well as either a mini-switch or a 2nd DPDT
2) As specified in the schematic, this has a very clean sound. If you crank the drive control past 50% and switch Sw1 to connect C5 to the source of JN2 you get a nice grind with humbuckers - see mods for use with single-coils
3) Mods I really like:
- If you want more of a "hot 12AX7" - or a Beefier Proph Tweed sound - use a J201 for JN2 and a 3K resistor for R1 - I also recommend this for use with vintage single coils
- If you really like the Fenderish "expander" aspect of this circuit's sound - use a 3K resistor for R1
- If you want the most authentic Champ sound - add some warmth by attaching a 220pF cap from Dr2 (the drive pot wiper) to ground
I put references to WILLING HEART MINISTRIES for anyone wanting to support the work of an artist named Kelly Willard. Kelly Willard's music is extremely inspirational, even for a rocker-Satch fan like me, and if this generates some support for her Christian ministry - I would be overjoyed.

Well here's the sound clips for the Vibin' Champ (VC):
Note 1: I used Torchy's sugestion and made R1=R3=3k and 2 J201s - Sounds the best to me - THANKS!!!
Note 2: Its really hot here today - (no AC and I do these in my attic

- 100+ degrees.. Yikes!) I did these clips quickly so I would not pass out - please excuse the roughness of the sound and playing...
Note 3: In the heat my S470 developed a buzz, so there is some buzz in the HB clips - it's my guitar/playing not the VC
Setup1: Ibanez S470 (w/Gibson Classic '57/'57+ pickups) -> VAMP (for small combo)->computer sound card
Clip 1: Clean Neck HB: VC set to Dr:30%, Tr:50%, B:50%, Vol:70% :I played using the neck HB pickup w/out the VC on for a D-G-D chord set then added it - so you hear the change when activated, then I played the same blues like stuff in all of these clips
http://www.mojotronics.com/images/vibinchamp/vc_4_clean_HB.mp3Clip 2: Over-Drive Neck HB: VC set to Dr:70%, Tr:70%, B:60%, Vol:50% :I played using the neck HB pickup w/out the VC on for a D-G-D-am chord set then added it -
I play one lick, turn the vol back to 80% on the guitar, play just about the same lick, then turn it back up. The rest of the clip I try to show how the VC cleans up with pick attack when used as an overdrive
http://www.mojotronics.com/images/vibinchamp/vc_5_dirt_HB_N.mp3Clip 3: Over-Drive Bridge HB: VC set to Dr:70%, Tr:70%, B:60%, Vol:50% :I played using the bridge HB pickup w/out the VC on for a D-G-D chord set then added it... This clip I try to show how the VC has a bit of grit - as an overdrive - I should have turned the bass up a bit...
http://www.mojotronics.com/images/vibinchamp/vc_6_HB_BR_dirt.mp3Setup2: Warmoth (Swamp Ash) strat (w/Fender Fat '50's pickups) -> VAMP (for small combo)->computer sound card
Clip 4: Squeeky Clean Strat Neck: VC set to Dr:30%, Tr:50%, B:50%, Vol:70% :I played using the neck pickup w/out the VC on for a D-G-D chord set then added it - so you hear the change when activated, then I played the same blues like stuff in all of these clips. In this clip I switch the VC in and out 3 times (the VC level is a bit louder - so you can hear it kick in) in the first 1/2 of the clip, then I use the Guitar's vol control and picking attack to control dynamics in order to demo the sensitivity
http://www.mojotronics.com/images/vibinchamp/vc_7_clran._strat.mp3Clip 5: Over-Drive Neck Strat: VC set to Dr:70%, Tr:70%, B:60%, Vol:50% :I played using the neck pickup w/out the VC on for a D-G-D chord set then added it - so you hear the change when activated, then I played the same blues like stuff in all of these clips. In this clip I switch the VC in and out a few times (the VC level is a bit louder - so you can hear it kick in) in the first 1/2 of the clip, then I use the Guitar's vol control and picking attack to control dynamics in order to demo the sensitivity
http://www.mojotronics.com/images/vibinchamp/vc_7_dirt._strat.mp3You can here from this last clip that it does not have a lot of overdrive using vintage strat pickups - but with a FatBooster in front of the VC it sounds very much like a small Fender being over driven with a booster... I really like that sound myself.