Wei-Ya 19" Universal Chassis from dirtcheap trading

plgDavid

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Wei-Ya 19" Universal Chassis from dirtcheap trading

Hi

I ordered the 19" chassis that dirtcheaptrading sells on ebay with an add that includes:

"You must find a CRT with these specifications:
1) Will fit 10 pin neck, not a 8 pin neck
2) Measure the ohms of the vertical winding on the yoke (Green and Yellow Usually) (Red and Blue are horizontal)
The measurements should be between 11 to 17 ohms (Low Impedance) or more than 37 ohms. (High Impedance).
Isolation transformer required."

But the unit received is Wei-Ya 820H which is for high impedance 10pin tubes. I have a two low impedance tubes
A51QDX993X001 with V:11 H:4.9
A51KQN011X with V:11.8 H:4.1

Haven't plugged any yet since I have a question for which I didn't get a satisfying answer.

I asked them what the two H/V 4 pin headings were for on the chassis, if they were to use one impedance or the other and the answer was: "This chassis can still be used on low if it falls within the range in my ad" which seems to contradicts everything else I've read here, according to the add my tubes would work, but according to http://www.8liners.com/datatech/monitor.html I need to change 3 parts (which I wouldnt mind if i was 100% that was the thing to do).

I will post pictures of the chassis tonight when i get home.

Thanks for any suggestions!
 
As is the case with virtually all "universal" replacement monitor chassis, the two 4 pin yoke connectors are for you to select a "normal" picture or "mirrored" picture to display.

Mirrored will flip the image upside down and backwards for use in a cabinet where the image is bounced off a mirror. Like certain gun game such as Terminator 2.

Never plug or unplug the yoke connector with the monitor powered on.

For a low impedance yoke, you should have gotten a model 1220H chassis. The 820H is for high impedance yokes. Connecting a low impedance yoke to a chassis designed for high impedance will damage the chassis immediately upon power up.

The parts to change the chassis for high to low they have listed on the 8-liners website is for the Jen Shinn chassis that 8-Liners.com used to sell. I do not believe those part numbers apply to a Wei-ya chassis.

Don't forget, these chassis need to be "Americanized" to make them compatible with existing cabinet connectors and test equipment.

http://forum.arcadecontrols.com/index.php/topic,97584.msg1029468.html#msg1029468
 
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As is the case with virtually all "universal" replacement monitor chassis, the two 4 pin yoke connectors are for you to select a "normal" picture or "mirrored" picture to display.

Mirrored will flip the image upside down and backwards for use in a cabinet where the image is bounced off a mirror. Like certain gun game such as Terminator 2.

Never plug or unplug the yoke connector with the monitor powered on.

Thanks Ken.
Ok. I just use DPDT switches on the joke wires in my other vertical G07 cab (of course I turn it off before).

For a low impedance yoke, you should have gotten a model 1220H chassis. The 820H is for high impedance yokes. Connecting a low impedance yoke to a chassis designed for high impedance will damage the chassis immediately upon power up.

If I try and add a resistance in series what is the worse that can happen?
(EDIT: guess that gives me the answer http://forum.arcadecontrols.com/index.php?topic=66820.0)

The parts to change the chassis for high to low they have listed on their website is for the Jen Shinn chassis they used to sell. I do not believe those part numbers apply to a Wei-ya chassis.

There probably exists a similar hack for that board. I guess we would need a 1220H schem to compare.
 
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Dirtcheap trading replies: "This is the only model they still have in production for a 19". It will work on the specs i have posted. I have installed about 50 of them personally."

What if ... he's right and that somehow the _newer_ 820H's are tolerant to 11 to 50ish impedance due to some recent design change?

That might explain why 8-Liners now only ship WEI-YA's and don't bother to update their monitor's page with details on how to convert impedance on their old JEN SHINN chassis?

Anybody knows more, or bought a 19" chassis from 8Liners recently?
 
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