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| Massive old vacuum tube, anyone know what it is? |
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| gbaddeley:
I’m leaning towards a high current switch at a few KV, but the trigger mechanism is not obvious. Possibly had a low pressure gas, possibly partially ionised by the side tube / filament arrangement. Similar to a Krytron? A smaller diameter ceramic tube could be placed down the anode tube, to do circulated water cooling, but this device does not seem to be massively high power dissipation (multi KW continuous). |
| LaserSteve:
At the time this was in use, a hollow anode would be used for vapor phase,, ie steam cooling or oil immersion cooling. DI water was not so easy to make back then. I've seen the remains of cooling pools at some very old transmitter sites. If the anode has a low Z window at its bottom , ie copper, it might be X-ray. Copper was hated as a low Z material. its better know for use in X-ray crystallography where its modestly high Z is useful due to spectral shaping. There is what looks like a Cadmium Silver or Tig weleded braze line half way down the anode where it reduces in diameter. Crystallography/ x-ray diffraction is a legit College use of X-rays. I just can't see a hollow anode tube being efficient or easy to collimate. Steve |
| Cyberdragon:
A gas fill would be easy to detect, does OP have a plasma globe or any such HV source to see if something ionizes? You wouldn't see much, so darken the room. |
| macona:
--- Quote from: gbaddeley on July 13, 2021, 10:41:38 am --- Possibly had a low pressure gas, possibly partially ionised by the side tube / filament arrangement. Similar to a Krytron? --- End quote --- Nah, the side piece is a TSP. They used them on a lot of their other pieces they made like this one: Untitled by Jerry Biehler, on Flickr Untitled by Jerry Biehler, on Flickr |
| dmills:
Flow things are common in gas lasers, where the main beam current acts as an ion pump and they need to provide a gas return path that is long enough to prevent the silly thing ionising that path instead of the main one (It also provides time for triplet quenching). I was thinking xray generator, but one big vacuum diode looks a lot like another. |
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