[Amps] Tube testing?

[R.Measures]

On Nov 24, 2004, at 10:12 AM, Gary Smith wrote:

> In amp that uses  3cx800a7's, is there any way to determine if one of 
> a pair (or more) has gone south other than by simply replacing it to 
> "make sure?"

Gary -- A 5kV max high-pot tester and an ohm-meter will test for 
everything except peak emission.

>
> What I did (and this may be wrong as all get-out) was take a Raytek 
> laser thermometer and read the temp of the tube on the exposed plate 
> area.
>
> What I found is there was only  a 7 degree F. difference between the 
> two, 128 deg and 135 deg.  Not very scientific but... at least I know 
> there is something goin on inside that sealed envelope to indicate to 
> me that the electrons are swapping places at a pretty good clip to 
> generate lots or RF.
>
> If there might be a better way other than pay many $$$.$$ to have them 
> checked by the manufacturer, I would like to hear about that method.
>
> 73
> Gary
> WA6FGI
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org