As far as the forum goes, I don't think anyone has put one in an 18 Watt. Since I don't have any familiarity with 18Watt, my first suggestion as always would be to PM Coco by clicking on the red Coco in the moderator section. I've looked at the layout and THINK that pin 7 on V3 would be the Output for Fx and Master Volume would be the Input (don't know which that would be on a TMB). Drill the chassis so the board tube is no CLOSER than a 1/4" from other components (the plans say no less than a 1/4", but I think that is somewhat confusing). So when all is said and done, I really don't have any GOOD advice on how to proceed, it just seemed no one else was replying. Sorry, just sharing thoughts. Hank
_________________ "The only problem with being retired is you never get a day off"
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