Re: yoke resonant frequency

"Offhand, I'd think if we wanted to build a common XY monitor, wouldn't we want
to use parts from a more common monitor? Like somehow figure out how to make a
vector monitor using most of the parts from a G07? Or maybe just the tube,
yoke and flyback? Maybe just the tube and flyback?"

You can't really use any of the magnetics from a raster monitor for a color
vector display. If you think about it, the two deflection coils are running
at 15khz and 60hz, so the H and V windings have very different inductances

Flybacks for raster monitors are designed to operate off of rectified 110,
so they are driven with higher voltages than the stand-alone vector designs

Here are some of the voltage values used by different HV designs:

Original Vectorbeam +/- 18 regulated from 25
Ampliphone +/- 24 regulated from 27 (my board has a power resistor across the regs)
WG color +/- 27
WG B&W +40
G08 +63

All of the messages sent to vectorlist are archived on www.spies.com/arcade/vectorlist
which is why I send out lots of mail messages sometimes.. just to make sure I
have this info saved SOMEWHERE :-)

I've been working through all of the magnetics in the different monitors. I have
most of the yoke data now, for all the monitors that I had that needed convergence.

As soon as I get the portable LCR meter that I ordered (Circuit Specialists has a
really nice looking one for $200.. we'll see what it's like when I get it) I can
get the inductance values for an Ampliphone and late model G08, with the newer tube.

---
We've been talking for a while about what to do about the damn monitors burning up,
so what i'm trying to do is 1) figure out WHY they burn up and 2) fix the design,
especially for the G08 which has two custom parts on it and a bunch of out of production
parts (MPS u series and main deflection transistors). There seems to be a lot of
similarity between the basic deflection amplifier designs, so I think it is possible
to have a basic design that would work in either chassis. 
Unless there are a lot of people without monitors at all, I don't think there is a
need for a completely new monitor. My guess at the total demand for this stuff is
maybe a couple of hundred.. The unit costs on custom flybacks and deflection coils
is going to be really high in those volumes. One thing that might be nice is trying
to start watching for deflection coils and convergence rings on CRTs getting tossed
out.. those are the parts that would be useful save (and they don't take up the
storage volume that a crispy fried Tempest CRT does..