[Boatanchors] Question: X-Rays from 3B28?
gbabits at custertel.net
Sat Feb 14 09:50:48 EST 2015
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
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
----- Original Message -----
From: "William" <w_b_morton at hotmail.com>
To: "boatanchor" <boatanchors at puck.nether.net>
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
> 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
> 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,
> Boatanchors mailing list
> Boatanchors at puck.nether.net
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