On 08/11/2011 14:44, Ron Youvan wrote:
> richard N7RC courtway wrote:
>
>> Lots of information around concerning the real need to HI-Pot /
>> Getter glass tubes - especially concerning the popular 3-500 series.
>> But not so much concerning the same need for Ceramic / External Anode
>> tubes. How come ?? Do they actually need the same attention - if
>> not - why not ??
> You can't run the finned plate of an air cooled plate orange or red, so
> the MFGs spot weld
> gettering washers and disks to the leads between the base and under side the
> elements.
> (operating the plate red would damage the metal to ceramic seal)
... and the thermal "mass" of an external anode tube is huge compared
with the relatively small internal anode on something like a 572B or a
3-500Z... hence which the same amount of kinetic energy make a 3-500Z
glow orange but only raises the temprature of a 4CX1000 or 8877 by say
50 degrees.
Mike
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|