I wouldn't loose any sleep over X-rays from the 3B28. I've never heard of
that before. The X-Ray deal goes back to the old B&W TV rectifiers with
their 1B3(?) or something like that. I have heard of x-rays from the 866
tubes.
My question is why would you waste a pair of 2500 volt rectifiers on a 450
volt power supply. The 5U4 or 5R4 would handle that with plenty of head
room.
73,
George
W7HDL
----- Original Message -----
From: "William" <[email protected]>
To: "boatanchor" <[email protected]>
Sent: Friday, February 13, 2015 8:42 PM
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
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