Amplifone / WG6100 Yoke rewinding attempts

[dezbaz]

I just re-measured the horizontal winding of a Rawland / amp 19" yoke

The size is 0.6mm (0.0235")

 

[LyonsArcade]

I'm just wondering, what's the ohms measuring out on the two windings? I've been working on a cinematronics monitor today, and the ohms were surprisingly low, something like .4ohms and 1.2ohms! I thought the yoke was shorted but I measured another I had and got the same measurement.

So I'm wondering, do all vector yokes have really low resistance?

 

[m_mcgovern]

Awesome

WG or Amp?

Rewinding 25" raster yoke to wg6100.

 

[dezbaz]

Rewinding 25" raster yoke to wg6100.

Are you using a 25" 100 degree tube? or 19"

 

[dezbaz]

I'm just wondering, what's the ohms measuring out on the two windings? I've been working on a cinematronics monitor today, and the ohms were surprisingly low, something like .4ohms and 1.2ohms! I thought the yoke was shorted but I measured another I had and got the same measurement.

So I'm wondering, do all vector yokes have really low resistance?

A previous thread revealed values of 0.9 and 1.3 ohms

Not as low as 0.4, maybe the cinematronics is lower again, compared to the Wg6100's/Amp 25's

 

[m_mcgovern]

Are you using a 25" 100 degree tube? or 19"

25" 100 deg arcade tube. I have one used and two New.

 

[dezbaz]

Anyone reading this, guys don't be afraid of yoke winding.

The yoke simply deflects the gun/s that is turned on at the instant. This happens thousands of times per second. The convergence is not messed up by the yoke, it is messed up by the fact the yoke was removed.

I plan on doing a writeup on getting the convergence perfect again. It's not the yoke's fault. It's just in the wrong position, or the rings are.



I learned a lot from the last few weeks of collecting parts from TVs on the side of the road. In my state, we have people who break open TVs on the road verge, & remove the yokes from them to cash in for the copper. It's great for me, as it means I can come in and get the convergence strips in about 5 seconds. The TVs that had the most: Sony 25" or above.

While Sony's can't be used as a Vector tube, it tells us that even the manufacturers had trouble converging. AND here's the info I learned, the average number of convergence strips is 6 on a large Sony. The most I collected was 8, and the min was 5.

Almost always, there were at least 3 x 1/4" circular magnets too. So 6 strips AND 3 magnets

I picked up about 50 convergence strips last week, and plan on perfecting convergence. I don't care if I have to use 10 strips and 5 magnets.

Moral of the story, don't fear yoke rewinding. That will do. [/rant]

 

[Level42]

The number of used convergence strips is an indication of tube quality.

As a general rule, the bigger the tube, the more strips are required.

But if you have a lot of 19" tubes from the same manufacturer and they average on let's say 3 strips then the production tolerances on the tube was better than when you have a series of same CRTs with an average of 6 strips.

F.I. my "modern" Kortek monitor I put in my Ms.Pac has a lot more of these strips then the average older monitor I have here. You can bet the CRT maker had less strict production tolerance.

It would be funny to try and get a Sony tube running on a vector just to see how it looks

 

[dezbaz]

The number of used convergence strips is an indication of tube quality.

As a general rule, the bigger the tube, the more strips are required.

But if you have a lot of 19" tubes from the same manufacturer and they average on let's say 3 strips then the production tolerances on the tube was better than when you have a series of same CRTs with an average of 6 strips.

F.I. my "modern" Kortek monitor I put in my Ms.Pac has a lot more of these strips then the average older monitor I have here. You can bet the CRT maker had less strict production tolerance.

It would be funny to try and get a Sony tube running on a vector just to see how it looks

But sadly they have different neck pins and different voltages

 

[Level42]

Yeah Sony....always have to be different. I will never buy anything from them again. All the things I bought from them broke down sooner or later.

 

[dezbaz]

Had some requests on how to do this so I am adding a diagram from my notes



Now this is a WG6100 Yoke diagram, (Same yoke used on Star Wars 25" Amplifones)

Wire cable was purchased from Brocotts in the UK (eBay)
http://myworld.ebay.co.uk/switchedkwb/?_trksid=p4340.l2559

 

[EclipseEye]

Awesome, thanks Dez, following with great interest.

 

[komodo]

But sadly they have different neck pins and different voltages

Doesn't their shadow mask also have an impact on whether it would work for a vector game or not?

 

[dezbaz]

Looks like this is the closest (For the Amplifone 19")
http://www.ebay.co.uk/sch/i.html?_n...re&_sac=1&_osacat=0&_armrs=1&_ssn=switchedkwb

 

[jrok]

Moral of the story, don't fear yoke rewinding. [/rant]

Ph33r the Convergence !!!

- James

 

[dezbaz]

Ph33r the Convergence !!!

- James

LOL

Nice to see you check in James

 

[Level42]

Doesn't their shadow mask also have an impact on whether it would work for a vector game or not?

Isn't that only for Trinitron tubes. I know these are unusable. I'd still like to see how it would look though but too much work for just a bit of fun...

 

[Homepin]

Isn't that only for Trinitron tubes. I know these are unusable. I'd still like to see how it would look though but too much work for just a bit of fun...

Trinitron tubes don't have a shadow mask as such - they have tightly strung wires running from top to bottom - think piano string - that's why, if an owner of a Sony allowed it to run with vertical collapse the beam would cut through the wires and destroy the tube.…..

 

[jrok]

Isn't that only for Trinitron tubes. I know these are unusable. I'd still like to see how it would look though but too much work for just a bit of fun...

The biggest problem with trinitron tubes is that they are FST CRTs so that means they have to use dynamic focus, basically adjusting the HV focus depending where on the screen the beam is. To use an FST with a XY someone would have to design in a focus adjustment circuit, not impossible but just another thing to think of
- James

 

[mcandrewsoun]

I decided to give this a shot.. I need a monitor for my Black Widow, and have an extra amp deflection & hv board. The magnet wire is cheap, so what the heck.. I started with a 4600 yoke. Looking at my Amp yoke, it looks like there are two wraps on each core. 27 wraps per section, 54 on each layer, for 108 total on each core. I got one core done tonight.. Will post pics and updates tomorrow.