Hi Brian, As far as I know, Schafner is a bad brand during the 80's, through early 2000's. They work ok in the USA, but in the 240V world, they like to let their smoke out. The RIFA sort that are a pr

Although the allowable range of capacitors for a line filter are quite large, not all X and Y class filter caps are used in the line filters. They are quite often used as snubber capacitors in switchi

Most of the fancy IC's in the 7000 series are socketed, using the little insert style of socket pins. Look for a bit of white rubber stuff around each pin on the component side for confirmation. -Chuc

Resistor wires are made for use with plain old plugs. Resistor plugs are made for use with copper wires. You never use both in a system. Further, resistor wires almost always have inadequate terminati

Probes die new in the box. Don't let appearance do the diagnosis. Try the probe on the other inputs. If it doesn't work everywhere, try disassembling it into modules, and reassembling the modules... T

It is probably one of four things: 0) A bad probe... check to see if the problem follows the probe. 1) corrosion on the BNC female pin... a little deoxit will help. 2) a burned out attenuator... repla

I have more than a bit of trouble believing that using a clear filament will result in an optically clear skirt. I would expect that it would be at best translucent. I doubt that you would be able to

It is my understanding that the metals are decorative only, being as they are metal particles fuzed with a plastic binder. Not solid metal. Or is this something else? -Chuck Harris Tom Gardner wrote:

I see SLA as a method, not a plastic. It stands for Stereo Lithography Apparatus. A photo cured plastic resin is put in a tank, and lasers hit it from two different axis, curing the resin into a hard

2445 and 2465 are quite a bit different than the 2465A... particularly in the controller department. No battery, but rather an EAROM. No muffin fan, but rather a siemens motor with a squirrel cage fan

You won't break the collet if you don't turn the slotted screw! The slot is there so you can loosen the nut without turning the slotted screw (and breaking the collet). Simply put a screwdriver in the

Hi Adrian, A discharge implies a short circuit, and perhaps a plasma... nothing of that sort happens. A continuous beam current occurs, as there is a continuous stream of electrons in the beam, and th

If the 453 has a mesh, the even larger screen'd 454 would have to have one too. I think that the schematic may be a bit inaccurate, as the geometry anode is usually after the horizontal plates, but th

Hi Albert, On my 7854 and 7904, the reflection is a near perfect circle, with a dim bright dot in the center. It looks like a perfect copy of the high intensity spot with its halo. There is a slight d

I think I was wrong when I said that neither the 465 nor the 475 exhibit the "7904 phenomenon". They do, they just have to be at very high intensity before the phosphor gets enough electrons to light

Hi Albert, If you take a BB gun, and shoot a brick sitting in the middle of a sandbox, at about the same spot, 10 degrees off of orthogonal, the BB's will bounce up into the air, and fall back down on

The 7904 phenomenon is what we have been discussing. When a slow, but bright trace sweeps across the screen, you see both the dot of the normal bright trace, and a dimmer, fuzzy, ghost spot. The ghost

Indeed, now show that it doesn't happen with an overly bright non mesh lens system. I have seen the same stuff on my very old, and probably now no longer working 513D, which has neither a lens, nor an

I went back for a look through my manuals, and I found a couple of things: 1) 465 and 475 schematics both say that there is a mesh element between the horizontal plates and the screen. 2) 2465 days th

Any scanning electron microscope (SEM) operator will tell you that secondary emission caused by the electron beam striking the object, is a very real phenomenon... Aluminization of CRT phosphor was do