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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