hey jok3r, have you tried using BS170 instead of 2N7000?
As I understand, they are pretty much interchangeable. Careful with orientation: they "face" in opposite directions. Anything to add from your experience, Jim?
Tried the BS170's.. 1 - They make no difference in the noise factor here, still noisy. 2 - They are a slight bit rounder/warmer sounding, maybe a good thing, maybe not... depends on what you like. I like the 2n7000 more because they sound plenty warm and seem to give it an extra bit of edge. Also, I like them because they are CHEEEP! I can get like 50 2n7000's for the price of 5 BS170's. Don't get me wrong, if the BS170's made an improvement in the tone, attack, gain, "NOISE" and over all better sound I would not hesitate for a moment to buy/use them over the 2n7000's but, I actually think the 7000's sound better!
Ok, Here is "MY" fix for the HUM/NOISE... This works!!! As I said a couple pages back if I stick a retail tube screamer (mine is the TS7 with the TS808 mod) with buffered bypass (not true bypass) in front of the Engl preamp pedal it kills the noise and the guitar volume knob roll back noise increase problem 100%!!! That is just with the TS in bypass mode. There is no gain loss, no tone loss, no sustain loss just kills the noise 100%! The only noise left is pure high gain and normal noise associated with high gain, a little bit of noise is to be expected but it's very minimal considering the gain this thing puts out!! There is a distinct difference between "normal noise" and this constant over riding low level hum that consumes the sound! It's like there is another guitar cord unplugged laying on the ground buzzzing in the background. Anyway, the buffer in this TS7 completely cures this 100%.
Now, I have built a TS input buffer and it didn't work,meaning it didn't fix the hum sound like my TS7...
I used this buffer, pretty common... 2nd diagram.. I tried a 2n5088 and a 2n3904http://www.muzique.com/lab/tsbuff.htm
Must not be the same as the TS7 buffer? Anyway, if you look up the schematics for the TS7 you get different buffers with different schematics etc.. Looks like the "real" schematic is using two 2SC1815's for the input/bypass buffer? Or, am I reading this thing wrong? Sorry, can't find the link for it but I have the pdf... Whatever the TS7 is using is the ticket to a 100% bug free working preamp!!!
Edit: still can't find the original pdf to the TS7 but found this and has some cut outs from the schematic, one has the input buffer...http://www.marksmart.net/gearhack/ts7/carboncomp/carboncomp.html