[Amps] ameritron update on blown grid resistors.

[R.Measures]

On Jan 3, 2005, at 8:09 AM, Dan wrote:

> Well.. I replaced the blown resistor hoping that it just went on its 
> own.. no go. quickly switched on the power and same resistor arc'd and 
> blew.  Does this mean the tube is bad? or at least an indicator? I 
> have again checked everythign related and in the area no burn marks on 
> anything BUT the resistor. Is there a way to test the tube or look for 
> something on the tube?

A high-potential tester will tell you if the tube has enough leakage 
current between the anode and the grid to blow the grid resistor.  
.Normal leakage-I is under 10uA at 3000v.

> I have ordered a new set of tubes and shoudl have ina coule of days 
> but right now I am looking for ideas  as I hate to put a brand new 
> tube in the amp until i know what is going on
> thanks for any ideas
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org