Ive gotten a bunch of tubes lately, one of the types I have probs finding any info on is this one, I believe it's some sort of bulb.
The russian description said vaccuum photo element...thats greek to me 🙁
http://www.briangt.com/gallery/album04/PICT0081
http://www.briangt.com/gallery/album04/PICT0082
Cheers
Magura🙂
The russian description said vaccuum photo element...thats greek to me 🙁
http://www.briangt.com/gallery/album04/PICT0081
http://www.briangt.com/gallery/album04/PICT0082
Cheers
Magura🙂
Yeah, looks like a projector bulb to me... if you have a whole bunch you wouldn't lose anything by plugging it into a 120 or 240V variac and seeing where it gets nice and white hot.
Tim
Tim
Magura,
Does an ohm meter show any continuity between the end pins? My initial reaction is that this is a small short arc lamp which would show no continuity. If that is the case a rather specialized power supply is needed to light it. It seems very dark. Unless that is a special filter coating the bulb has long use on it.
If you get no continuity try placing it in the microwave oven with a small glass of water to protect the oven for minimum load requirement. If it contains a noble gas like xenon under pressure it may glow for you helping identify the gas, and the lamp type. Xenon would glow whitish. Do not run for more than a couple of seconds.
I'd advise against "just plugging it into the 120 volt mains" in case it is a low voltage filament lamp. That will instantly ruin it.
Do you collect interesting vacuum tubes as a hobby? I do.
Does an ohm meter show any continuity between the end pins? My initial reaction is that this is a small short arc lamp which would show no continuity. If that is the case a rather specialized power supply is needed to light it. It seems very dark. Unless that is a special filter coating the bulb has long use on it.
If you get no continuity try placing it in the microwave oven with a small glass of water to protect the oven for minimum load requirement. If it contains a noble gas like xenon under pressure it may glow for you helping identify the gas, and the lamp type. Xenon would glow whitish. Do not run for more than a couple of seconds.
I'd advise against "just plugging it into the 120 volt mains" in case it is a low voltage filament lamp. That will instantly ruin it.
Do you collect interesting vacuum tubes as a hobby? I do.
I hope it isn't a Xenon, because they are pressurised to 5 atmospheres and are therefore extremely dangerous.
This looks like a foto tube, not a projector, but a detector that converts light into current, I had some of those once. I believe they are also called photo multiplier tubes. There is some info on the net.
Jan Didden
Jan Didden
I used to have a photomultiplier tube.
It was used in a 16mm projector to measure the light transmissivity of a film soundtrack and was connected to the input of an amplifier. A very interesting way to retrieve sound information. I never ran a film through it, so I have no idea how it was for sound quality.
It was used in a 16mm projector to measure the light transmissivity of a film soundtrack and was connected to the input of an amplifier. A very interesting way to retrieve sound information. I never ran a film through it, so I have no idea how it was for sound quality.
Hi,
That's what I think they are as well...Similar in function to the RCA GL-930 perhaps.
Magura,
If you like I can forward whatever info you have to a local tube dealer.
Meanwhile maybe this site can be helpful with the rest of your stash:
FROZEN NUGGETS...
Cheers, 😉
That's what I think they are as well...Similar in function to the RCA GL-930 perhaps.
Magura,
If you like I can forward whatever info you have to a local tube dealer.
Meanwhile maybe this site can be helpful with the rest of your stash:
FROZEN NUGGETS...
Cheers, 😉
Not a photomultiplier.
It isn't a photomultiplier - they have a sequence of anodes known as dynodes that deliberately stimulate secondary emission at each anode so that the initial electron produced by the original photon is muliplied 2, 4, 8, 16, 32, 64 etc, depending on how many dynodes are present (ten is common). The dynodes look rather like louvres, and the valve has a pin per dynode, so they always need bases with lots of pins
It isn't a photomultiplier - they have a sequence of anodes known as dynodes that deliberately stimulate secondary emission at each anode so that the initial electron produced by the original photon is muliplied 2, 4, 8, 16, 32, 64 etc, depending on how many dynodes are present (ten is common). The dynodes look rather like louvres, and the valve has a pin per dynode, so they always need bases with lots of pins
Aha? The tube I had did have internal louvres, looked kind of like a staircase for the multiplying effect you mention, but AFAIR there was only a single output pin. The multiplying effect was kind of internal.
Jan Didden
Jan Didden
Most certainly not a PM tube. Even if the voltage divider for the dynode chain was internal, which I have never seen, a PM tube is usually a sub-millamp device. There is also several types of dynode chains, depending on use.
I used to do PM tubes and photon counting for more than 20 years.....
Kind of looks like a Xenon projector lamp, though, as indicated...
I used to be a projector machinist in the very early 70s, but we still used arc lamps (!). Xenon projectors were part of the theory , though.
I actually have a license for such work...... makes me wonder where that is lurking..................
I used to do PM tubes and photon counting for more than 20 years.....
Kind of looks like a Xenon projector lamp, though, as indicated...
I used to be a projector machinist in the very early 70s, but we still used arc lamps (!). Xenon projectors were part of the theory , though.
I actually have a license for such work...... makes me wonder where that is lurking..................
Maybe this info should have been included in the first place.
If you look at the first photo, you will see the dessignation in russian...the first 3 letters that is. I cant type those russian letters so youll have to look at the photo. after the 3 letters it says "-51". Does that help any?
The tube is brand new, one side is metallized for the sake of reflection (I believe), the other side is clear.
Cheers
Magura🙂
If you look at the first photo, you will see the dessignation in russian...the first 3 letters that is. I cant type those russian letters so youll have to look at the photo. after the 3 letters it says "-51". Does that help any?
The tube is brand new, one side is metallized for the sake of reflection (I believe), the other side is clear.
Cheers
Magura🙂
One pin of this tube is connected to that metallic side and the other pin is not connected and just stays in the middle of the tube? If yes, then this tube is photo sensor - try to light at it and measure the voltage on the pins.
rcavictim said:
Ah, another good suggestion.
Nothing too specialized, you could test with a neon sign transformer and see what it does. For full operation you may need a current-limited 800VAC (OCV) power supply capable of oh... 20-50 amperes.
Yes, interesting things happen when glass is in direct contact with pure plasma at 20,000°F+...
True. Good reason to use a variac and maybe transformer.
I do, although I don't have a habit of seeking them out...
Tim
Attachments
Ive found out that its a photo sensor.
It gives 55mV at regular room light intensity.
Thanks everybody!!!
Magura🙂
It gives 55mV at regular room light intensity.
Thanks everybody!!!
Magura🙂
Valve/tube collecting
Tim,
That Raytheon tube you showed looks like a waveguide mounted TR switch for microwave radar. I could not find it in TubeLore however. My second guess if that was wrong is a klystron for a laboratory microwave signal generator.
I collect interesting tubes and valves but probably as you, not by seeking them out. I just hold on to them as I acquire them and in all my years didn't throw many tubes away. Those that I did I am frightfully sorry for now. I used to have quite a collection of interesting small CRT's now long gone but my collection has come back in those a bit since my last move 7 years ago. I wouldn't consider myself a tube collector really. I have a bunch of the more interesting looking ones in a glass display case in my home as technological curiosities mostly. Vintage TV sets with round picture tubes....now for those I consider myself a collector! Much deliberate searching, travel and expense to purposefully drag a large quantity of those across the border and eventually home, although I haven't bought one in several years now due to having run out of space in which to display them. 🙁
Rob
Sch3mat1c said:
Tim,
That Raytheon tube you showed looks like a waveguide mounted TR switch for microwave radar. I could not find it in TubeLore however. My second guess if that was wrong is a klystron for a laboratory microwave signal generator.
I collect interesting tubes and valves but probably as you, not by seeking them out. I just hold on to them as I acquire them and in all my years didn't throw many tubes away. Those that I did I am frightfully sorry for now. I used to have quite a collection of interesting small CRT's now long gone but my collection has come back in those a bit since my last move 7 years ago. I wouldn't consider myself a tube collector really. I have a bunch of the more interesting looking ones in a glass display case in my home as technological curiosities mostly. Vintage TV sets with round picture tubes....now for those I consider myself a collector! Much deliberate searching, travel and expense to purposefully drag a large quantity of those across the border and eventually home, although I haven't bought one in several years now due to having run out of space in which to display them. 🙁
Rob
Magura...
those things had a special name for them...?? Haven't seen one for ages!
Was it Cadmium Sulphide for the active element?
Strange though, -- the heavy terminals somehow indicated a large current device....always somehting new to be learned.......!
EDIT:
Just googled up this one, - my internal memeory isn't that bad afterall 😉
http://www.phanderson.com/printer/cadmium/cadmium.html
those things had a special name for them...?? Haven't seen one for ages!
Was it Cadmium Sulphide for the active element?
Strange though, -- the heavy terminals somehow indicated a large current device....always somehting new to be learned.......!
EDIT:
Just googled up this one, - my internal memeory isn't that bad afterall 😉
http://www.phanderson.com/printer/cadmium/cadmium.html
Re: Valve/tube collecting
Yep, klystron. I forget what frequency (1-2GHz?) but it's in the mW range. I think TDSL has something on it. ... Yep, two from the Valve Museum and one from WPS. 1.5-3.75GHz, 140mW max.
I've wondered if I could use it as an esoteric tetrode instead.
P.S. I've got a cute viewfinder CRT... 1" diagonal.. 😀
Tim
rcavictim said:
Yep, klystron. I forget what frequency (1-2GHz?) but it's in the mW range. I think TDSL has something on it. ... Yep, two from the Valve Museum and one from WPS. 1.5-3.75GHz, 140mW max.
I've wondered if I could use it as an esoteric tetrode instead.
P.S. I've got a cute viewfinder CRT... 1" diagonal.. 😀
Tim
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