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On the Sunn T, the DPDT switch is wired IN BETWEEN the 3PDT foot switch and the Sunn T board. The BI on the 3pDT wiring board connects to the IN on the DPDT switch. The NORMAL and BRIGHT wires from the DPDT switch connect to the NORM and BRIGHT input pads on the Sunn T board. I hope this helps.
Very helpful info. Thank you.
Okay I have it “finished up” but still not in the enclosure. Everything responds how it should so far except the middle setting of the DPDT has a very faint dry tone when both of the other settings are nasty dirty. Any idea what might be causing that? I can post pics if that would help. I did turn the trim pots according to the directions Billy sent in December.
Glad I continued, it is proving to be nasty just testing and tweaking. Thanks again you guys for always being so helpful!
Your DPDT ON-ON-ON switch has a different internal contact pattern than the one shown in the Build DC. In the middle position, it is not contacting both circuits. Flip the switch pattern over and move the jumper to lugs 2 and 4. Connect NORMAL to lug 1, IN (from the foot switch) to lug 2 and BRIGHT to lug 5. That should do it!
Here’s a poorly drawn picture of how I have it currently and what I interpreted the most recent directions to mean. Is this what you meant? Am I correct in proceeding?
Start your numbering from the top left lug and number down and counter-clockwise from there. That will put lug 4 at the bottom right corner. Move the jumper to that new number 4 position. If your switch has the internal contacts in the middle position I think they have, then you should be OK.
As the build doc stated, different switches may have different internal patterns for the middle position. You can determine your pattern by using your DMM to measure continuity (short) between the lugs in the middle switch position.
Thanks so much everyone if you’re reading this. It works properly and (barely) fit in the enclosure. Feels so good to have this completed and no longer in the back of my mind.
cheers!
Well done! What will be your next project? You can’t stop now!
Hello!
I’m a total noob and this is what I tried to build first. Everything seems to be working except for the two gain pots. The sound is actually good (just like the demo clip on youtube), but the gain doesn’t change when you twist the pots (seems to be fixed at around 75%-100%). Then I tried to alligator clip the 3rd pins of both pots straight to ground (bypassing R5 and C12), then the pots would work, but with much lesser gain. Sounds clean even when set to max.
I am assuming that the problem would just be a cold solder somewhere or I may have fried R5 and C12 when soldering.
Any suggestions?
Post some nice clear images of both sides of the board and your offboard wiring to jacks 3PDT etc so that we can trace it
Disperse – it would be a better idea to start your own thread so we do not confuse your issues with those of the OP.
Okay I kinda found the culprit. The pots that I got were mislabeled as 1M but were only 10K when I measured them.
Apologies for hijacking the thread. I’ll be posting a new thread if the pots I get doesn’t solve the problem.
Cheers!
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