Dear all,
Recently I purchased a VHF Amplitec amplifier, model UG:2-20/350, based on one
single GI7B.
I noticed immediately the bad condition of the bleeding resistoirs (many of
these were blown), so I replaced both the HV capacitors, diodes and bleeder
resistors. During a quick test the result was a 50 watt more output, isn't that
nice :-)
Now that I did some serious testing, I noticed a pretty high input SWR (SWR is
1:2.5), which my Kenwood TS790E does not like at all. Transceiver pushes a
maximum of 25 watts when the ampifier is on TX. This 25 watt results by the way
in a pretty decent 350 watt RF output.
I wrote HA8UG several emails for support (mainly a digital copy (or payed copy
even!) of the service manual), still waiting for reply.
What could have cause the excessive input SWR? What is more likely, a
misalignment internally in the amp or is it the tube that is (a bit) worn out?
Who can help me obtaining a copy of the user-manual, the service-manual and
some guidance to get this amp back to operational 'life'?
Vy 73, de Kees.
AmateurRadio : PA7TWO
- M5TWO Locator: JO22jp.
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