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Re: Tube identificaion help (833)



  This 833 has a graphide anode. But FYI, a graphide
anode tube must be run at a anode temp high enough
to cause the anode to glow a dull red to cherry red
color in order to properly "getter" gas from within the tube.
The tube will run fine with no color, but will actually last
longer if the anode is run at its design temp.

Mark Graalman


On Wed, 24 Feb 1999 16:04:25 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
>Original Poster: David Trimmell <davidt-at-pond-dot-net> 
>
>Hello, I know there are several folks on this list who have used 833
>transmitter tubes in Tube coils. I have two 833's that came from a 
>local
>radio station, and on the boxes they had marked "833-A", but these 
>tubes
>have a thick plate, aprox 1/4". The plate is unlike the standard
>"sheet-metal" variety, it is a light grey-silver, almost like pewter 
>in
>color and is somewhat rough on the surface, with close inspection. The
>overall construction quality is significantly superior to the Amprex 
>833A I
>have. The light grey color of the plates seems to light in color for
>graphite, but these tubes do run very cool in comparison to the 
>Amprex. No
>markings on the envelope, but there is a serial number on the ceramic
>insulator at the base of the plate.
>
>Any Ideas guys?
>
>I understand that there is a 833-A, 833-C and a 833-D, what are the
>characteristics of these? I have the data-sheets on the 833-A, but 
>cannot
>find any info on the other varieties. Appreciate any help!
>
>Regards,
>
>David Trimmell
>
>
>

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