Hi John, > "kf0m" <[EMAIL PROTECTED]> wrote: > I am working on repair of a TLD6612A 2 meter repeater amp > that runs a pair of 8560AS tubes.
Should be quite the smokin' signal when you have the amplifeir in line. > It worked fine for a number of years and then suffered > what appeared to be lightning damage. > > The insulator between the plate line and the plate tuning > disc was arced through among other damage. It is a rectangular > piece of clear material that looks like mica. If it is a clearish but dark material it probably is mica. If it's the thicker white insulating material it might be beryllium oxide, which has danger warnings about breathing any dust from the material when drilling or cutting into it. > I tried adding some Teflon tape to cover up the puncture. Nope, ain't gonna work. > When I fired up the amp today, It arced through again during > the tune up process. Anyone have suggestions for a replacement > or have one in their junk box? > > John Lock > kf0m at arrl.net Google mica sheet and or look at companies like McMaster Carr. You can often find small sheets and parts at woodstove and appliance repair places/stores. www.antiquestoves.com is one place I found some mica sheeting available on line. And of course I searched "mica sheet" on Ebay and hit 10 or so supply sources right off the starting line. cheers, s.
