I've had quite a few email's requesting information on this old Lovepedal design that's supposed to emulate that classic "Fender on 6" tone. Well, I've got a schematic for you. First here's the description from the Lovepedal website:
"Reminiscent of the mid 60's Blackface Fender era. Specifically a Blackface Super on 6.
Plug the Super 6 in to a ANY clean amp to nail that mid-60's American amp tone. This unit will turn a small amp into a much larger sounding amp instantly.
With an onboard vintage tone stack to die for, you now have ULTIMATE control over ANY guitar / amp / effects combination.."
And a demo video:
The schematic was originally drawn up by reveriesof on the freestompboxes forum, I've redrawn it for you for ease of understanding:
[NOTE - the input cap should be 100nF, the output cap should be 10nF, this is also true for the 100n cap that bypasses the tone control - it should also be 10n]
With a note to the corrections - I like the pedal with a few little alterations; instead of the 510R resistor I like a 390R which gives you a little extra gain, I like a lower value input cap (22n instead of 100n) and a larger value output cap [the cap that comes before the tonestack right off the 3k3 resistor] (100n instead of 10n). It's a really simple circuit which is great for modifying - get some different value caps and go wild - you'll find something you like.
As you can see it's a deviation from the standard Lovepedal formula of "modified Electra/LPB booster". That BS170 is a mosfet device and they have nice clipping characteristics of their own without requiring any clipping diodes. The "vintage tonestack" is just low pass/mid boost cut type control.
Here's a great little PCB layout(Showing full of board wiring as well) produced by Sinner on the Freestompboxes forum - Cheers Sinner!
Here's the original freestompboxes forum thread for your viewing: