re hv diodes in article hpfcso fc hp com myers hpfcso fc hp com bob myers writes nope the dag is on the outside of the tube and is grounded the inside aluminization is the second anode and is connected to the anode suction cup this with the glass of the tube in between is a capacitor and is used as the power supply bypass filter for the hv supply some smaller scope tubes don t have an aquadag coating on the outside if they are in mu metal shields you still have a capacitor actually and i think i said this in the original but perhaps wasn t clear enough there is usually both an internal and an external dag of the two the internal dag is the more important the aluminization of the back of the phosphor is in most cases not adequate to guarantee connection to the anode button and in the case where the gun assembly includes an accelerating electrode at anode potential most definitely does not provide that connection bob is indeed correct here in more than one way a look in the old rca picture tube manual backs this up as does sams reference data handbook the internal coating around the perimeter of the crt not the aluminum or tin crt face coating is referred to as a dag as well as the outer coating thankfully i didn t need to go to a f library to find it either one sparkling water for mr vanderbyl no caffeine in that is there dave medin phone w ssd networking h intergraph corp m s gd internet dtmedin catbyte b ingr com huntsville al uucp uunet ingr b catbyte dtmedin everywhere you look at least around my office the opinions expressed here are mine or those of my machine
