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18 watter can be quite sensitive to it's lead dress
The original 18w.com TMB was especially sensitive to lead dress to v2. The sIII is pretty good. The Trinity TMB design reorganized the tubes in order to reduce/eliminate the problem.
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Is there any problem running the OT's output wires under the board up to the selector switch? I also plan on shrinkwrapping them for this portion of the run.
That's the way I do it & it works. The run is not long. Suggest you braid them.
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Regarding the many wires leading from the board to the various pots... I've seen several pics with these running closely together. Some are even shrinkwrapped (grouped together). Should these wires be kept away from each other or is it acceptable to run them next to each other? .
Much easier to use cable ties to hold them together neatly. I would not put shrink tubing on them
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I see things like the first filter cap on almost every drawing and wonder why it isn't installed with the 2 positive terminal facing inward?
Good idea. Go fo it! Neater and less wiring is usually better
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I realize most of the above falls under the heading of personal preference but I just wanted to confirm I'm not missing something. I'm also open to any of your suggestions and personal lead dress preferences.
Route the mains wires outside edges/corners of the chassis & twist them together.
Put heat shrink over the ends of the shielded cables on the tube ends.
Put the 68K grid resistors right on the tube pins.
Use shielded cable from Volume to V2 on TMB/sIII channel.
Cable tie the control pot wiring.
Route the B+ , standby ets. in between the tranny & board and Cable tie together