>
>
>On Sat, 26 Sep 1998 20:39:06 -0700 (PDT) igor rosky <irosky@yahoo.com>
>writes:
>>
>>
>>reading eimacs Fault Protection it suggest this resistor for tube of
>>1500 watts or less, and a more complicated system for larger thoriated
>>tungsten tubes,
>>is using B+ current limiting resistors in 9k 3amps power supplies
>>still appropriate,
In my opinion, yes.
> >this would require very large wattage resistors to
>>meet eimacs 50 joule and less energy dissapation,
I doubt that the 50 joule limit is needed for larger tubes.
>......
>>Igor
>
>High power and cheap are not often attainable Igor!
amen, Carl.
>At 9KV you will need several resistors in series to stay within the
>individual voltage ratings.
>225W wirewound resistors are not that expensive new; about $11 each for
>Ohmite at Mouser.
>
A problem is that Ohmite 225w rated resistors do not have a fault rating.
For a fault-rated resistor, one needs to go to Cesivid, Inc. - 716
286 7610 Or, one could perform fault tests on non-fault rated
resistors to see where they come apart. . . My experiences with
tetrodes with handles suggests that limiting I fault-peak to c.100 times
the anode/plate I rating is adequate. Thus, for an 8171, 25 ohms will
probably do the job, provided that it does not break down during a
glitch.
- later, Igor.
Rich. Measures. Web site: www.vcnet.com/measures
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