[Amps] Ten Tec Titan 425

[Mark Robinson]

On my 425 the input swr has changed dramatically with different Chinese 
replacement tubes. The original EIMAC's presented a very low swr on all 
bands. Now with the Chinese replacements I am using a manual tuner 
between the rig and the amplifier. For instance I see a 2.5:1 input swr 
on 160m.

73 Mark N1UK

On 15-Dec-20 4:47 PM, doug ferguson wrote:
> I have a Titan amp that has over time, presented an increasing SWR to my Elecraft K3S.  I have a SteppIR beam so it appears to
> be an input network problem in the Amp.  I use the tuner in the K3 and all is good – full output from the Amp.  The SWR varies by
> band with 40m being the worst at 3:1.  The tuned network in the Amp consists of a fixed disc capacitor and coil for each band.  These capacitors are pretty stable and very difficult to get to to unsolder and test – seems unlikely they would all be changing which points
> to a different issue but I don’t see what would cause this.  Hoping someone has a suggestion on how I can solve this.
> Thanks, Doug N7NM
>
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