[Amps] FL 2100B OUTPUT PROBLEMS

[RAY FRIESS]

Just because they appear to be okay and light up, doesn't mean that they are good.  
The best way to be sure is to swap them out with known good ones.
 
I have a 2100B myself, which had previously been used by a CBer and had been abused by overdriving.  When I got
 it, the tubes lit up and appeared to be fine.   However, the amp would only put out 100 watts ...
I put in known good tubes and it has been pumping out 600 to 700 ever since...
 
 

 

> From: dtruss at 4netparalegal.com
> To: amps at contesting.com
> Date: Sun, 8 Jan 2012 07:52:14 -0700
> Subject: [Amps] FL 2100B OUTPUT PROBLEMS
> 
> I recently purchased a FL2100B and initial setup and loading, the maximum
> plate current was 250ma.
> 
> After tinkering with assorted levels of input from my exciter (775dsp) up
> to 100 watts, the AMP was
> 
> able to draw less and less plate current and finally, little to none on any
> band. Loading and plate tuning had
> 
> little effect on output as monitoring on external SWR cross needle Bridge.
> 
> Pulled the tubes, they were PENTA LABS coded 9602, both. No physical
> indication of damage and filaments do
> 
> Light.
> 
> Any thoughts would be appreciated.
> 
> Dr. G. Carl, W7BQ
> 
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