I'm looking for a Sony 07MAB2 green CRT. It's from the metal chassis light box with the over\under high voltage and power supply setup. I have a couple of them scrapped, but the one I need uses the single focus pin small neck tubes, while the ones I have are the large neck variety.
Tube doesn't need to be strong, it only needs to be free from air....... ;)
John
Did you give VDC in Georgia a try ?
Incedentally, a word to the wise. Put a scope probe on the PS output to the fly, WITH ALL ANODES DISCONNECTED. One time I had an unexplained busted CRT in an RPTV and found the 130V line going up to about 200V. It happened pretty fast, the shutdown couldn't catch it.
Basically don't put any tube in it until you see it work with the other two tubes. You might not be able to get video because of the AKB, but when you get to the point where you don't hear a SNAP and crackle, then is when you install the tube.
Having a blue tube crack is one thing, it is pushed the hardest usually and can run pretty hot. Also as seen in NAPs the bluescreen from a VCR can blow it up sometimes, with the family happily sleeping in front of the set on a Saturday night. Having the green or red go like that raises alot of red flags for me, mainly because I'm a PTV specialist. These things have a pretty gnarly HV section and if unchecked by regulation can do dasterdly things.
The newer line of Sonys, which you got, I'm not totally sure, but in the slightly older ones, like the EXRs, they cannot run with a shorted HV regulator. I do believe they gave up on that architechture when they changed to the new line, which is when they dropped the SD (big neck) CRTs.
At last calling, VDC could not supply the SD series CRTs, but that doesn't mean they don't have yours. If they even have it, you are going to have to get an OK for about $375 or so, the CRT will be at least $200.
Actually the last CRT job on an RPTV we sold was because I got it running with the other two CRTs and the customer saw it and said yes.
I think you can fool the AKB circuit, there was some talk of a resistor. Another way I think if you just put about a 22K to 100K resistor from the cathode terminal to the 220 volt supply it should work. Seeing that much is good, then you know if you got convergence problems etc., also you get to check the yoke. When a CRT breaks, sometimes to also need a yoke. A coworker missed this a while back and Leonard saved the day. It was NLA and the CRT was on the way. That was the same set with the 200V 130 V line.
Could have had a very bad day. That's why I mentioned it. You must disconnect the CRT socket as well as the anode, it might short out the focus voltage or something. Leave the yoke connected of course. Along with letting the set run, it will test the yoke. The only one extremely improbable problem you might have with that yoke would be a shorted vertical winding. Any other problem will cause something, whether it's shutdown or whatever in the geometry of the other two CRTs.
This little stickler is something I learned recently, like I already knew, but was convinced to see the picture before ordering big ticket items. My boss used to be a tech, and says whenever possible I want to see a picture before calling the quote.
He was proven right in spades late last year. Had a Sony, needed whatever, I don't remember, but I told him it's up and running but no tuner. He insisted on seeing something in the way of real video on it, OK needs a tuner, we just grabbed a DVD player.
Sure as shit the CRT had internal damage and there were black flecks all over the about upper half of the screen. You could not see this with snow.Strange thing was on that set, the purity was fine. My eye is trained enough to detect a purity problem on snow, but we had black dot/spots. I did not see it.
JURB
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.