[TenTec] Plate Voltage reading on Centurion

[Dr. Gerald N. Johnson]

On Wed, 2009-02-04 at 17:37 -0500, john wrote:
> Hi Everyone,
> My trusty Centurion (which will still pump out rated power on 20m without a 
> great strain) seems to have the plate voltage dropping to what reads now ~ 
> 2400V. Since it was at TT less than a year ago with a good bill of health, 
> I doubt the electrolytics are failing, especially since the amp seems to be 
> making full power (though I rarely run it that hard).
> 
> Is the meter shunt known to go bad on this ?  I do have a Fluke HV probe 
> for my 87 and am capable of measuring it safely.  I'm guessing TT still has 
> the shunt itself should I need one.

On a volt meter its called a multiplier. Its not wired in shunt with the
meter. High voltage has been know to cause resistors to change value.
Age and humidity have often caused moderate quality resistors to drift,
usually high in value and that would make the meter indicate lower
voltage.
> 
> Thanks for any info
> John k5mo

73, Jerry, K0CQ