William- Unless you are operating above 10kV, there is not an x-ray concern, and even then, onles "soft " x-rays are present, the problems with x-rays manifest themselves above 15 kV or so. They should work fine at 450V, lower voltage drop than a high vacuum type.
Scott W7SVJ -----Original Message----- From: Boatanchors [mailto:[email protected]] On Behalf Of William Sent: Friday, February 13, 2015 8:42 PM To: boatanchor Subject: [Boatanchors] Question: X-Rays from 3B28? Hello All, Been thinking of using a pair of 3B28 tubes to rectify an output voltage to around 450VDC. That value is above the critical anode voltage value of 50V, so that should not be a problem. Current is less than the 500mA max listed in the table. With the output voltage far lower than the ~1000V values listed in the table, I think these things would not even break a sweat. Two questions for the experts: 1. Any issue seen operating arund 450VDC? 2. The tubes have a sticker on the base with a warning regarding x-rays. Why is there a warning on the tube base but nothing shown on the data sheet? I had no idea these would present an x-ray risk based on what I saw (and did not see) on the data sheet, so I picked up a pair. Perhaps this my learning experience for the week. Have a great weekend! Best Regards, William _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors
