Re: UNUSUAL CRT Instruments?

Don Black <donald_black@...>

Yes Tom, pretty much brute force. You might be right about the rotational speed, hope someone else can shed some light.
Is this a CRT as we understand it? Well it does use a beam of electrons hitting a screen (target) to emit photons, they are just a bit higher in frequency than the visible light we're used to looking at.

Don Black.

On 06-Sep-13 2:21 PM, Tom Miller wrote:

Hi Don,
Yes, that W anode gets hit pretty hard when the voltage is 150+ kv at 150+ ma.
The whole thing sits in an oil bath for cooling.
I guess different manufactures have their own designs. All the ones I have seen turn at about 1800 rpm.
----- Original Message -----
From: Don Black
Sent: Friday, September 06, 2013 12:04 AM
Subject: Re: [TekScopes] UNUSUAL CRT Instruments?


Thanks for the link to the nice photos Tom, It would have been nice if there was a shot of the anode face to see the score marks from the beam.
Are you sure it's rotated by a 60 Hz supply? I was under the impression that they spun up to 10,000 RPM which would need a much higher frequency. Of course, we could both be right and some just rotate at about 1800 RPM and some much higher.
The two filaments aren't to provide a spare when the first burns out (as in the double filament Audios, etc.) they are different size and position and allow different X-ray beam characteristics.

Don Black.

On 06-Sep-13 1:24 PM, Tom Miller wrote:

Here is a (typical) rotating anode x-ray tube.
The anode disk is attached to a rotor that is then attached to the external HV connection.
The tube is inserted in the center of a stator that is driven with 60 Hz AC, usually 120 volts.
All of the rotating parts are in a very high vacuum.
----- Original Message -----
Sent: Thursday, September 05, 2013 10:47 PM
Subject: Re: [TekScopes] UNUSUAL CRT Instruments?


On 09/05/2013 08:47 PM, Don Black wrote:
> It's not a CRT but a rotating anode X-ray tube has a (very fast) rotating element with external connection that has to carry
> significant current.

Is the rotating part in the vacuum, or in a pocket of the glass envelope?

Vacuum leaks with any motion and motion in a vacuum is nearly impossible to lube
for much lifetime...

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