Those remotes are IR/NIR, not UV. I have a UV camera and night vision tubes, but night vision is not sensitive to UV. They have specially coated optics that reject UV. The photomultiplier tube would be swamped/desensitized by ambient light. That's why it was taped up so excessively. Super sensitive. They will recover (usually) given time to rest.
Really!? Wow interesting. Hey clagwell! LOVE the LENARD tube video! I watch it a couple times a month! And the music too! And your other videos! I'm subscribed!
A bit unfortunate that was, yes. At least it was not exposed to direct sunlight (in the video) Usually though the tube will regain almost complete sensitivity if kept unpowered in a very warm and dark place for a few weeks
I looked up the data for the 931A photomultiplier used in the 1077 and it's response dies around 670nm. Infrared starts at about 700nm so I think the B&K just can't "see" the remote controls output.
I think you confused IR and UV around, remotes use IR, not UV. (that looked like a DirectTV remote, which if I recall can also do RF, but that doesn't matter here) As for the 60hz strobing LED picking up on that odd test rig (interesting, I don't think I caught what that was, and have no idea what that would even be for)... I suspect that the photomultiplier tube is either A) overwhelmed by the light, or the LED bulb is causing interference. - I don't recall if you mentioned if the scintillation detector was working before you started taking it apart or not. As for the crystal, I do recall someone doing a video on them, (here is one of them: a close look INTO a scintillation crystal (radiation detector) / sodium iodide + thallium / NaI(Tl)). Also while looking I found a really good video comparing scintillators and Geiger counters (Geiger Counter vs. Scintillator )
Was the PMT getting any high voltage from the oremaster? Unplug the PMT and check between pins 12 and 7 for about 1kv. You'll need a very very high impedance meter since the current is so small. The CRT hv meter should work. Once you have high voltage, throw the bad crystal away and get one of the plastic crystals on ebay. The plastic ones don't absorb water and go bad.
Those CDV 700 samples are fairly weak, I have some doubt the scintillation detector is completely dead. The cdv 700 is extremely sensitive, I bought a 700 with 2 working 725s and neither of them can even pick up the test sample on the side of the 700.
Hello, Well i should say ive watched all your vids. Just never said so until now. But i do want to say, i was at my local supermarket a week or so back and picked up out of the box some Tangelos, or Mandarins, one of the 2, i like them, easy to peal and nice taste, I looked again and it said product of japan. First thought Fukushima. Next thought Tepco lies. LOL i put them straight back and thought what a shame. I would never now want anything from Japan. Nice old Geiger counter you have, fix it so i can loan it aye, The supermarket trolleys are big enough to handle your old school counter :) Ps like ya underground vids the most
Those remotes are IR/NIR, not UV. I have a UV camera and night vision tubes, but night vision is not sensitive to UV. They have specially coated optics that reject UV. The photomultiplier tube would be swamped/desensitized by ambient light. That's why it was taped up so excessively. Super sensitive. They will recover (usually) given time to rest.
You murdered the photomultiplier the second you turned it on with ambient light around.
He did indeed......Scratch one RCA 6199 tube!
Really!? Wow interesting. Hey clagwell! LOVE the LENARD tube video! I watch it a couple times a month! And the music too! And your other videos! I'm subscribed!
A bit unfortunate that was, yes. At least it was not exposed to direct sunlight (in the video) Usually though the tube will regain almost complete sensitivity if kept unpowered in a very warm and dark place for a few weeks
I didn’t know Whites made such a product, I learned something new today
I all too often realize that I shouldn't have taken something apart. But haven't we all.. Lol
I looked up the data for the 931A photomultiplier used in the 1077 and it's response dies around 670nm. Infrared starts at about 700nm so I think the B&K just can't "see" the remote controls output.
Bob you know something about everything man. Loved your video on the 20 metal crt u just did! Stromberg!
I think you confused IR and UV around, remotes use IR, not UV. (that looked like a DirectTV remote, which if I recall can also do RF, but that doesn't matter here) As for the 60hz strobing LED picking up on that odd test rig (interesting, I don't think I caught what that was, and have no idea what that would even be for)... I suspect that the photomultiplier tube is either A) overwhelmed by the light, or the LED bulb is causing interference. - I don't recall if you mentioned if the scintillation detector was working before you started taking it apart or not. As for the crystal, I do recall someone doing a video on them, (here is one of them: a close look INTO a scintillation crystal (radiation detector) / sodium iodide + thallium / NaI(Tl)). Also while looking I found a really good video comparing scintillators and Geiger counters (Geiger Counter vs. Scintillator )
TV remote in a protective plastic bag. It goes well with sofa in plastic wrap...
The remote LED's are inferred not ultraviolet. Hope that helps .
I've been trying to repair one of these. Thank you so much! this is very helpful!
Was the PMT getting any high voltage from the oremaster? Unplug the PMT and check between pins 12 and 7 for about 1kv. You'll need a very very high impedance meter since the current is so small. The CRT hv meter should work. Once you have high voltage, throw the bad crystal away and get one of the plastic crystals on ebay. The plastic ones don't absorb water and go bad.
The sensitivity of the plastic is only about 25% that of the superior NaI(Ti) crystals.
Nice bit of kit!!!!
Interesting device.
Infrared is one thing and ultraviolet is other thing. The wavelenght is different.
I saw several flashes of white light, they were small dots that just blipped and gone.
Remote is IR. Tube is UV.
If you still have that unit, would you be willing to sell it?
Did you ever get this working?
Thanks for shareing
Nice
Those CDV 700 samples are fairly weak, I have some doubt the scintillation detector is completely dead. The cdv 700 is extremely sensitive, I bought a 700 with 2 working 725s and neither of them can even pick up the test sample on the side of the 700.
Did you fix it yet
Hello, Well i should say ive watched all your vids. Just never said so until now. But i do want to say, i was at my local supermarket a week or so back and picked up out of the box some Tangelos, or Mandarins, one of the 2, i like them, easy to peal and nice taste, I looked again and it said product of japan. First thought Fukushima. Next thought Tepco lies. LOL i put them straight back and thought what a shame. I would never now want anything from Japan. Nice old Geiger counter you have, fix it so i can loan it aye, The supermarket trolleys are big enough to handle your old school counter :)
Ps like ya underground vids the most
ME TOO!
Better stay with working on philco tv’s
You can get an app for this now right?
FlatBroke612 😂😂😂 probably!
You need to be rich just to power it lol.