CurtPalme.com Home Theater Forum

[cmjohnson]

So I've acquired a set of focus yokes from a Cine 9.

I intend to adapt them for use in a Marquee.

No big deal in principle, really. I've done the same thing before, just not with this model of focus yoke.

It has extra pins on it that I don't even know the functions for.

I'm used to working with yokes that have 9 pins, a ground and four pairs for focus and astig coils.

On a Marquee, two coils handle focus, and two coils handle the dynamic astig function.

Does anyone know what additional functions that a Cine 9 (and, maybe, a 909) has that uses the presumed extra coils in these focus yokes?

I say "presume" because I doubt they'd have added pins that are connected to nothing.

What additional electronic beam adjustments do you find in a 909 or Cine 9 that you don't find in a Marquee?

[cmjohnson]

I found the 909 service manual online and I see what I'm looking for now.

The 909 and Cine 9 have both 4 pole and 6 pole astig adjustment systems.

A Marquee only has one astig adjustment system. I can try and see if it'll work with either one of them,
and if it'll work with the 6 pole adjustment system, then that would probably be the better one to use since it seems likely that
I won't be able to use both.

Visions are dancing in my head of a complex monstrosity consisting of one heavily modified Marquee with the brain (CLM) out of a second one, along with the astig amps, jerry rigged to the first one with baling wire and duct tape, to run the second astig coil set.

Nah, I think'll pass on THAT mod!

[the dude]

You can't substitute the 4 pole with the 6 pole, the 6 pole isn't better, its just the next finer adjustment. The 4 pole makes the dot round and if they end up as triangles you can use the 6 pole to further improve focus by correcting that. If you have only one dynamic astig, you want the 4 pole.

But you can use 6 pole "cpc" magnets for static corrections if you have triangular dots. The coils are for dynamic triangular corrections in the corners, something that is nice to have but you may call it luxury.

[cmjohnson]

Yes, I use 2/4/6 pole CPC sets. I'm still going to experiment with seeing what happens if I decide to use the 6 pole system instead of the 4 pole system in these focus magnets, just because it's easy to do.

In fact, on my testbed machine, which will initially have ONE CRT assembly in it, I'm going to appropriate the astig from the red or blue channel to run the 6 pole astig magnets and be able to instantly unplug them to compare the difference between using only the 4 pole and using both the 4 and the 6 pole systems.

This will allow me to get a very clear appreciation of what the effect of dynamic 6 pole astig is on the picture.

I want to know if the super high rated resolution ability of the Cine 9 is due in any significant part to the contributions of the dynamic 6 pole stigmators.

If I were to decide to attempt to fully implement a 6 pole astig system in a Marquee, frankly it's beyond my skill level. It'd require
substantial hardware mods to the CLM, add a second stig waveform board, add a second stig amp board, create all the new connections needed, and develop new firmware to support it.

WAY over my pay grade.

I can conceptualize it, I could even draw up the flowcharts and diagrams for it, but actually implementing the changes? I know my limits. That's beyond those limits.

[gjaky]