richard44 wrote:To the JOK3RX,
I don't know if anyone monitors this post as it's a bit old, but I wanted to thank you for your Tight Rock schematic, and detailed explanations of the conversion of the Tight Metal to Tight Rock. I was preparing to make a Tight Metal and had prepared a vero board and an enclosure, but as fate would have it, got delayed on actually building it, probably because, though the Tight Metal sounded amazing, it was way too much for my needs (I'm old school - think of a time when the sounds of Randy Rhoads and Vivian Campbell were the definition of 'Metal'). Anyway, when build time finally arrived, I found your Tight Rock schematic. From YouTube videos, the Tight Rock seemed much more suited to my tastes, so I followed your schematic and notes (from 3/16/14 and 3/15/14, respectively) and in all positions you discussed, converted my vero to a "Tight Rock" build. All I can say is, holy Christ, spot f--king on! The Tight Rock is one of the greatest pedals I've ever built. Certainly "Rock" is a misnomer. This is beyond "Rock", and even beyond what "Metal" used to be in the old days. Words are words, but the proof is in the sound - this thing nails everything from old school Van Halen to all things modern.
A few comments / questions. . .
1) Regarding the extra components in the "Tight Rock" between opamps 3 and 4, namely, the 220k parallel with the 475k/3n3. Since those parts are not in the "Tight Metal", I thought their addition would reduce gain (via the Gain Boost switch). Since the "Tight Rock" has less gain than the "Tight Metal", it seemed to me that when these components were in the circuit (switch 2 to 3), it would mitigate the gain, and when these components were bypassed (i.e., the switch connecting 1 to 2 in your schematic), it would be higher gain (like the Tight Metal). However, I found it to be exactly the opposite. Could you offer some insight? I.e., why would those components add gain?
2) I'm puzzled by the "Tight" pot. When fully rotated to 5PM, the tone just gets thinner and more trebly. Not quite what I expected there. I saw a video of James Brown demo-ing the pedal, and that pot lived up to its name. Was wondering if you, or anyone else out there, built this and had the Tight pot work as advertised. (Even without its extreme settings, set in the middle, it allows for a huge range of wonderful sounds to be had).
3) I found your "Gate" pot to be reversed (unless I somehow wired it incorrectly originally).
I'm sure any faults are mine, but was wondering if you or anyone else could share insights or experiences with this build.
Thanks again to the JOK3RX for an incredible option to the Tight Metal,
Well, it's another misnomer that the "Tight Rock" has less gain than the Tight Metal! I have owned both and I can tell you that with confidence... Over all I actually prefer the TR over the TM but they both have their places. As for the gain boost switch I am not really sure why they are in parallel? I need to get the Tight Rock back up on my bench ( I still have it in pieces) so I can go back over that part again. I had a hard time with that little area when tracing since some of the traces disappeared under the micro switch on the board. The traces are confusing as hell on these pedals and I kinda got as much of it done to satisfy myself that it was indeed almost identical to the TM with the exception of a few minor component value differences. I leave mine with the boost on all of the time and that is essentially bypassing those two resistors and the 3.3n cap which in turn is just like the TM configuration... I know what you mean about the "Tight" pot and I can tell you that it works exactly the same on the retail amptweaker pedals, and I hate it! I don't know how that is supposed to be making anything tighter? It should be called the thin chocked out knob if anything and again it works the exact same on the actual amptweaker pedals. I have heard many players say they don't like it and never turn that knob, leave it completely dialed down all the time. That feature could be left out in my opinion since the pedals are already just about as tight as tight can be! It's like adding water to water to make it more wet...
Not sure about the reverse pot on the gate? It's possible on some of the earlier layouts.. In any case, that's very easily corrected. I am not a real big fan of the gate as it seems to cut some sustain and edge off the notes but it works very well with palm mutes and chuggin rhythms etc.. I can't stand the gate as it is on amptweaker pedals with it gradually increasing with the turning of the gain pot! The gate in the max position absolutely kills the tone and sustain and needs to be independent of the gain control! In my opinion it's only useable in the very very lowest levels where it gates enough of the noise to make the sound quieter but right on the edge if ya know what I mean. The dual gang gain/gate pot is a cool idea but it has to work.. As it stands I don't like it, if it worked like a Decimator then I would probably like it a lot, but it doesn't and honestly I don't expect it to.. With it independent/separate from the gain control I can get it dialed in to be almost silent without sucking too much life outa the overall sound and tone... If I were going to have something like this pedal on a "Pro" rig I would use a Decimator!
Glad you like the pedal and I agree, anybody will be hard pressed to find a more neck breaking bad ass pedal!! I use a tube screamer to some extent in front of nearly every high gain pedal with the exception of the TR and the TM! It's like it has a tube screamer built right into it!