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Posted: 4/29/2021 7:08:45 PM EDT
[#1]
Quoted: So what are the chances of getting a filmless 14 that has the same or worse specs than a omni 8? It depends who you buy from -- I've heard of people getting absolutely screwed by shady dealers because they didn't know any better. The L3 18UM minimum specs for SNR are worse than those for the OMNI VIII by like a decibel. On the other hand, I'm pretty sure TNVC's lots are "18UM", so the sky's the limit as far as that goes. If you're buying from a reputable dealer who will hand-select tubes to a desired performance, focus more on getting the best SNR/EBI/Halo you can. |
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Posted: 4/29/2021 9:56:37 PM EDT
[#2]
Call TNVC, tell them the specs you want and you’ll get them when you get to the front of the line at no extra charge. Also, their 18UMs are well below minimum.
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Posted: 4/30/2021 6:31:12 AM EDT
[#3]
18um technically has a lower SNR min, but it's pretty rare to see that happen.
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Posted: 4/30/2021 7:54:52 AM EDT
[#4]
Quote HistoryQuoted: Call TNVC, tell them the specs you want and you’ll get them when you get to the front of the line at no extra charge. Also, their 18UMs are well below minimum. Their tubes have amazing screen cosmetics, as well. Kindof an "unquantifiable" other than "no FPN", but it seems like more than that, to me.  Attached File Attached File |
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Posted: 4/30/2021 8:26:48 AM EDT
[#5]
Quote HistoryQuoted: Their tubes have amazing screen cosmetics, as well. Kindof an "unquantifiable" other than "no FPN", but it seems like more than that, to me. https://www.ar15.com/media/mediaFiles/453733/20210324_210417_jpg-1924339.JPG https://www.ar15.com/media/mediaFiles/453733/20210324_215510__1__jpg-1924338.JPG FPN is luck of the draw. There's absolutely tubes from TNVC with noticeable FPN. |
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Posted: 4/30/2021 9:08:34 AM EDT
[#6]
Are there any demist shields that are metal? I'm looking a used TNVC one I got but I'm not sure if it has a demist shield or if it's just part of it and not removable. It looks to be shiney metal, it doesn't look to be the lock ring or whatever it's called as it sits above it.
Not wanting to start another thread to answer a simple question. |
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Posted: 4/30/2021 9:59:09 AM EDT
[#7]
Quote HistoryQuoted: FPN is luck of the draw. There's absolutely tubes from TNVC with noticeable FPN. I told them not to send me one. Specifically. They obliged. This is why TNVC is so awesome. They are accommodating and have the volume to be. That tube is a 35.7snr, 0.5ebi, 0.7 halo, 72lp tube with no spec sheet blems and no fpn, and a PCR of 2500+, Just like I asked for. |
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Posted: 4/30/2021 3:05:51 PM EDT
[#8]
Quote HistoryQuoted: Are there any demist shields that are metal? I'm looking a used TNVC one I got but I'm not sure if it has a demist shield or if it's just part of it and not removable. It looks to be shiney metal, it doesn't look to be the lock ring or whatever it's called as it sits above it. Not wanting to start another thread to answer a simple question. @CPT_CAVEMAN You're likely talking about the eye cup ring that the demist goes in. The demist will pop out of the ring. You can also remove the eye cup ring. It can be tough to remove because of thread locker but a gripper pad usually does the trick. |
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Posted: 5/1/2021 5:56:14 PM EDT
[#9]
Quote HistoryQuoted: I told them not to send me one. Specifically. They obliged. This is why TNVC is so awesome. They are accommodating and have the volume to be. That tube is a 35.7snr, 0.5ebi, 0.7 halo, 72lp tube with no spec sheet blems and no fpn, and a PCR of 2500+, Just like I asked for. What are the trades that got you to those specifications? I get SNR and Line Pairs in general but, ebi and halo are a bit vague to me and what they really mean to the image. I'm thinking thermal first since I'm not seeing a Night Vision scope that really grabs my attention. I might bite on a PVS-14 for less dedicated use though. TIA, Sid |
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Posted: 5/2/2021 1:31:21 AM EDT
[#10]
Quote HistoryQuoted: What is PCR? I get no blems and Fixed Pattern Noise. What are the trades that got you to those specifications? I get SNR and Line Pairs in general but, ebi and halo are a bit vague to me and what they really mean to the image. I'm thinking thermal first since I'm not seeing a Night Vision scope that really grabs my attention. I might bite on a PVS-14 for less dedicated use though. TIA, Sid Photocathode response: how easy it is for light to knock electrons loose...how sensitive the unit is. SNR usually runs parallel to PCR good/good EBI on the other hand is typically counter good/bad, not good/good or bad/bad. To have high pcr and snr and low ebi, is like a supermodel that isnt crazy. Halo is it's own thing, but halos below 0.5 tend to make a tube more fragile, imo. 0.7-0.9 is a good place. Has to do with mcp spacing. Lp is apparent. The sexiest one I've had was 39.3snr, 0.3ebi, and 0.7 halo. You just dont aee those specs outside of the 4micron mcp architecture stuff very often. *this is worth what you paid me |
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Posted: 5/2/2021 11:38:51 AM EDT
[#11]
Quote HistoryQuoted: Photocathode response: how easy it is for light to knock electrons loose...how sensitive the unit is. SNR usually runs parallel to PCR good/good EBI on the other hand is typically counter good/bad, not good/good or bad/bad. To have high pcr and snr and low ebi, is like a supermodel that isnt crazy. Halo is it's own thing, but halos below 0.5 tend to make a tube more fragile, imo. 0.7-0.9 is a good place. Has to do with mcp spacing. Lp is apparent. The sexiest one I've had was 39.3snr, 0.3ebi, and 0.7 halo. You just dont aee those specs outside of the 4micron mcp architecture stuff very often. *this is worth what you paid me 
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