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KC9UDX
April 13th, 2014, 06:09 PM
Here's another one the internet doesn't remember!

I've had this terminal since about 1991. About five year ago i quit working and today I finally got it on the bench.

The CPU is running. There is +5V, +12V, and -12V to the CRT unit. There is no EHT. I haven't measured the flyback primary yet, but the flyback does hiss when the horizontal sync isn't correct. So, I consider it safe to assume the flyback is dead. In this day of CRT taboo, where does one get a replacement flyback, or even cross-reference one? It is a Solentec brand marked E101291 and BS-1101.

Also, the CRT filament appears dim to me, so I checked the voltage. It is 4VDC. I'be worked on countless monitors and TVs over the years and never encountered this. In my experience, asbestos I can recall, they are usually 6.3 or 12V. It is a Clinton Taiwan 3520197-01. Is it possible 4V is correct?

KC9UDX
April 13th, 2014, 06:24 PM
Gee thanks spellcheck,

It's a Modgraph GX-2000

And my memory is getting bad but it has nothing to do with asbestos..!

modem7
April 14th, 2014, 04:11 AM
And my memory is getting bad but it has nothing to do with asbestos..!
So, lead then.


In this day of CRT taboo, where does one get a replacement flyback, or even cross-reference one?
The company [here (http://www.technotronic-dimensions.com/Products2b.html)] has a lot on offer.


Is it possible 4V is correct?
The company [here (http://www.crtsolutions.com/crts.html)] may help you.

KC9UDX
April 14th, 2014, 08:59 AM
So, lead then.Possibly. Or, radon, or a myriad of other possibilities.



The company [here (http://www.technotronic-dimensions.com/Products2b.html)] has a lot on offer.


The company [here (http://www.crtsolutions.com/crts.html)] may help you.

Thanks! That is very helpful.

I was able to spend some more time with it, and it seems I may not have to replace the $129 flyback. The HOT may be fried.

As for the filament voltage, I'll probably leave it and see what it looks like. If the display is too dim, I will probably up it to 6V.

KC9UDX
April 14th, 2014, 05:22 PM
Go figure. Who says tubes are obsolete and hard to find like transistors aren't?

Where on earth can I get a new MJE13008 or MJE13009 transistor?

modem7
April 16th, 2014, 03:36 AM
Where on earth can I get a new MJE13008
http://www.digipart.com/part/MJE13008


or MJE13009 transistor?
http://www.digipart.com/part/MJE13009

tingo
April 17th, 2014, 10:47 AM
Here's another one the internet doesn't remember!


Why don't you take a few pictures of it, and add to the Terminals wiki (http://terminals.classiccmp.org/)?
There are only a few Modgraph (http://terminals.classiccmp.org/wiki/index.php/Category:Modgraph) terminals there, none with pictures.
I think you will have to ask Richard for access, but other than that it just a wiki.

KC9UDX
April 17th, 2014, 11:29 AM
I could do that, pending access. Thanks for the suggestion.