I believe there's some, er, spirited disagreement, shall we say, about what the "correct" Hornby-Skewes schematic is, including debate around whether the tranny should be silicon or germanium and/or both at different times (but I think consensus is that Aron's redrawn schemo that antonis posted is wrong about the JFET; allegedly the correct part number is 2N4061, a PNP silicon BJT, which was misread as 2N4861, an N-channel JFET). Additionally the lack of input/output caps on Aron's schemo is also an error (I assume it was antonis who drew in an input cap there, and fair play for that). So I suppose caveat emptor or buyer be weird, as one will. Me, I like a good treble booster just fine, but I'm not ready to bring this one home to meet the parents just yet...