aryntha
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- Nov 17, 2009
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So, here's the question.
Last year, I ended up with what I was told was a JDSU 2214-25MLUP. Looks like it from the outside, (cylindrical JDSU ArIon casing) but, upon further inspection, it's a retrofitted tube in there one that appears to be "spliced in" with heavy heat-shrunk connections. I BELIEVE it might be a SpectraPhysics tube, (it's a bit smaller / shorter than the normal JDSU 2214 tubes) but i'm not sure. It doesn't "quite" fit, either, so the air holes aren't quite lined up with the heatsinks, but it seems OK when I duct the fan to it.
I was actually upset that it appeared to be 'junk' and not what it was purported to be, (as in not a JDSU 2214-25MLUP) and didn't want to risk a 'dramatic' test failure, so I let it sit. My original rationale behind this was: it also seems like someone at some point ran it without a fan - as part of the plastic shroud near the front is quite melted. So I figured it wouldn't light, or if it did, it'd also smoke. But amazingly, it did light, and didn't smoke. My operation of it hasn't caused any further melting, and the laser certainly works. But its behavior is strange... (to me at least.)
I'd get pictures (I might try) but it's mighty hard to get pictures into the cylinder.
I'm using a normal JDSU power supply, with the JDSU control head. It behaves strangely:
at 4A Idle, it puts out 4 lines; 458, some other blue, 488 and 515.
At running currents, it puts out 7 lines.
at 8a, switching from idle to run, it "peaks" at 65mW and then settles down to 50mW and stays there.
at 9a, switching from idle to run, it "peaks" at 75mW, and then settles down to 60mW and stays there.
At 10a, switching from idle to run, it "peaks" at 100mW, and settles down to 80mW and stays there.
Now the question is -- is this "peaking" behavior, a big 'surge' of power and then a die-off to a settling point -- normal? With such high outputs for a multiline, is it possible that even 8A is too much for this tube and that's why i'm seeing the peak and falloff behavior? I've heard of some NEC tubes (thanks Qumefox) that max at 8.5A, but others tell me that most will do 10A. I'll try to get pictures but there's not much in a picture that would distinguish it from a 2214 except for the splicing. But the behavior is what i'm more interested in, and am wondering if anyone ever saw this kind of behavior or what it could be ... Not enough air flow?
Last year, I ended up with what I was told was a JDSU 2214-25MLUP. Looks like it from the outside, (cylindrical JDSU ArIon casing) but, upon further inspection, it's a retrofitted tube in there one that appears to be "spliced in" with heavy heat-shrunk connections. I BELIEVE it might be a SpectraPhysics tube, (it's a bit smaller / shorter than the normal JDSU 2214 tubes) but i'm not sure. It doesn't "quite" fit, either, so the air holes aren't quite lined up with the heatsinks, but it seems OK when I duct the fan to it.
I was actually upset that it appeared to be 'junk' and not what it was purported to be, (as in not a JDSU 2214-25MLUP) and didn't want to risk a 'dramatic' test failure, so I let it sit. My original rationale behind this was: it also seems like someone at some point ran it without a fan - as part of the plastic shroud near the front is quite melted. So I figured it wouldn't light, or if it did, it'd also smoke. But amazingly, it did light, and didn't smoke. My operation of it hasn't caused any further melting, and the laser certainly works. But its behavior is strange... (to me at least.)
I'd get pictures (I might try) but it's mighty hard to get pictures into the cylinder.
I'm using a normal JDSU power supply, with the JDSU control head. It behaves strangely:
at 4A Idle, it puts out 4 lines; 458, some other blue, 488 and 515.
At running currents, it puts out 7 lines.
at 8a, switching from idle to run, it "peaks" at 65mW and then settles down to 50mW and stays there.
at 9a, switching from idle to run, it "peaks" at 75mW, and then settles down to 60mW and stays there.
At 10a, switching from idle to run, it "peaks" at 100mW, and settles down to 80mW and stays there.
Now the question is -- is this "peaking" behavior, a big 'surge' of power and then a die-off to a settling point -- normal? With such high outputs for a multiline, is it possible that even 8A is too much for this tube and that's why i'm seeing the peak and falloff behavior? I've heard of some NEC tubes (thanks Qumefox) that max at 8.5A, but others tell me that most will do 10A. I'll try to get pictures but there's not much in a picture that would distinguish it from a 2214 except for the splicing. But the behavior is what i'm more interested in, and am wondering if anyone ever saw this kind of behavior or what it could be ... Not enough air flow?
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