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[TCML] Larger top:was coil pic link
At Phil T.
Hello everyone. Yes Phil you are correct. It just so happpens that I am currently building a 9" x 40" top on my front porch as we speak. I built that top for the smaller of my coils and decided to build the big coil after I got the top in the pics finished. This new top is a wooden core with fiberboard disks on the perimeter covered with chicken wire, then layered with fiberglass drywall tape and then coated with body filler and drywall compound finishing with a good sanding for smoothness sealed with a layer of fiberglass resin and finally the aluminum tape.
To get the top's RoC smooth takes alot of work and patience. The 4" minor 32" major top I use on the smaller coil tuned out terribly compared with the one on the big coil because I was anxious to see the difference from the old corrugated top. It is well worth the effort to build a top like these but it is very time consuming. I will list the specs for my 10 in. in a different thread.
Your coil is fantastic. The workmanship is great. One of the best for its size that I have seen on the net. After seeing it at nottingham on your webpage I decided that's what I wanted from my coil and started building the big one in February of this year. I still have to build a control box and cart for my PDT and enclose the base. I actually ran the coil last night and got the ballast and tuning adjusted. It really made a difference in output. The funny thing is JavaTC predicted tuning at 9.5 turns on pri. 8% high but it ran best at almost 11turns. I still am playing with topload height to find optimum distance from sec. top turn. Are you planning to build any bigger coils in the future? You have obviously shown you know how it is done!
Well off to finish the top. Hope to get done before the fourth.
p.s. Am putting pics of last nights run on photobucket.
Jason in S.D.
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