....this thing is LOADED with gain. I mean LOADED and it has harmonics flying from every direction.
I'd like more headroom or less gain.
I'm using a 24v power supply. I have the source resistor at the 2nd stage at 10k and I'm using all J201's.
Should I try upping the resistor value and/or changing out the transistors for MPF102's? How can I tame the gain on this thing?
UPDATE: Ok. I changed the connections on the DC jack I'm using and tried the same circuit at 9v. It sounded exactly the same.
Leaving it at 9v, I swapped out 4 of the J201's for MPF102's; 4 MPF's to 2 J201's ratio. This brought the gain down dramatically, to too little gain. I swapped out two MPF's for J201's to make it a 2-4 ratio and this is starting to hit the mark. My guess is either 2-4 or 3-3 is going to nail it.
I've never messed with mixing/matching transistors like this, so these differences are new to me. I may try it again at 24v to see how the tone changes.
This thing does smoke with tone, though. It's a little trebley, but that may be due to the Digitech I'm running it through with headphones.
is the mini-tubes schem strictly available on the AMZ-CD (which I should really consider buying), or is it somewhere on the website that I'm not seeing?
Originally, it was posted on the AMZ website. Now, along with all of the other AMZ classics, it's only on the CD.
Get the CD. Those earlier AMZ effects are nice to build and sound good, but the MiniTubes has some great tones.
cool, thanks
The AMZ CD is worth it. Before the CD was created, I built a lot of Jack's circuits - all the ones I was interested in 8)
I got GREAT tones out of all of them. Very fun and worth it!