This PMT, made by Adit, has a magnificent dynode string, and is the standard model I use to replace bad tubes of all types. They are of much higher quality than pretty much any other PMT, and are so easily adapted for niche applications and replacements that I don't really use any other type of this size. These are attached to a base made with solidly mounted surface mounted components. It's wired to a 5 megOhm potentiometer, which allows for gain adjustment without changing the voltage on your Geiger counter. Included in this package is a lengthy roll of aluminum foil tape; one roll can easily wrap a dozen tubes, it's pretty much a must-have for any scintillation experiment fan. It's very thin, completely occlusive to light, and is the easiest (and best) reflector/lining I have used. It's kind of hard to believe there was a point when I didn't use this stuff. The tubes are clear, no scratches, tested and working. No scintillator is included. There are so many types of material that will scintillate in the presence of ionizing radiation, some can be found around the house. This is ready to use with any counter or rate meter that can use scintillation probes, literally plug and play. You can couple it with a scintillator of any type for permanent use as a probe, or easily make it an experimental set up. The possibilities are pretty much limitless; for anybody, but this is built so any novice with a scintillation probe-capable Geiger counter can experiment. Coffee cans make great containers, so do soup cans. Or you can build a pretty set-up with a little bit of soldering (or wire connectors, even) like I have in my home lab. One of the many experimental set-ups I maintain is precisely what is in this package, with a 10 turn precision potentiometer in place of the included potentiometer and a DPDT switch to select between the C (Ludlum) connector and the BNC/MHV (most other instruments) connector. A housing was fashioned out of PVC pipe; the connectors, switch, scaler and audio output taps are mounted in a small project box. I used a silicon adhesive (nothing special or "optical grade") to couple the tube with a 100ml Pyrex container. I used the foil tape on the inner surface of the Pyrex to reflect light inward, and also on the inner surface of the cap, which made it completely occlusive to light. Organic scintillators are usually available in 1x1 inch cubes, so I fashioned a holder out of 14 gauge (solid copper) wire that fits in to the Pyrex container. It holds the scintillator itself and has two clips to hold a source (I use 1 inch round disk/wafer sources, but it easily holds minerals and other sources too.) It took about fifteen minutes to make the holder assembly and didn't cost a penny. I could have used a clear bowl or any other piece of dishware, but I wanted to keep it compact and already had the Pyrex. At first, it was quick and dirty, but I eventually turned it in to a permanent fixture. Several people have managed to adapt these for use with the CDV 700! That is both amazing and far beyond my scope of knowledge, but message boards are a resource I will refer a person to if I can not answer a question. All components are tested and work well. Please make sure that your counter is PMT-friendly before purchase. Unless this item is not as described, it is one of the few that I must sell with a no-return policy. It is vital to ensure your equipment is compatible prior to purchase. I can't allow returns on this item because four out of perhaps twenty I have sold over my lifetime were supposedly defective, but worked just fine when I received them back. Even the one which was deliberately destroyed to justify a return worked perfectly when used on a new base! The guy wasn't particularly creative about it; it was blatantly obvious. Five different surface mounted components don't just detach themselves; and knife/plier marks certainly don't just happen to appear where those five components "must have fallen off during shipping", hahaha. Seriously now, I haven't ever seen a single resistor come off of one of these boards and I have used more than a hundred of these tubes! Any money generated from my eBay sales goes to paying for a $1400/month medication used to treat my autoimmune disorder which forced my retirement after just 8 years of practice as a health physicist; at the age of 31. I do everything in my power to be good to my customers; many of you repeat customers with whom I have experienced the pleasure of chatting with, learning from, teaching and even befriending will attest to this on the enthusiast forums. I enjoy the hobby; I have truly embraced going from a professional back to my roots as an amateur again. I am by no means asking for sympathy or pity. I am simply not a seller who can afford to have somebody purchase an item with the intention of testing it out to see if it works with their device; then returning it under a pretense or assumption that it doesn't work. I will happily work with you to determine if this is likely to work with your equipment before you buy it. I am not an engineer, but I know an awful lot about these things. That is why I absolutely can not accept returns on this item unless we have discussed it thoroughly, tried to troubleshoot, and it really seems to be defective.
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