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i need to know about the little trimmer by the relay. I have read, i think, it is the grid adjustment not sure. Also have been told it was for the input. Need to know the correct way to adjust. 238
In theory, you put a SWR meter and coax jumper between the radio and the input jack of the amplifier.
Key the radio and amplifier, tune for best modulated power.
Now set the SWR meter's calibrate side and switch to read SWR.
The trimmer should reduce the reading, but won't get it very low in my experience.
The 180 was designed to use with tube-type radios that don't care too much about SWR when driving an amplifier.
This post shows a rebuild, including a small coil we add to the input trimmer cap. Serves to bring the input-side SWR better than the trimmer can do it alone.
Thanks a lot.I have had so much trouble finding info on a MKll 180. So i included pics of mine. The only things that look to be changed are the caps & it has 6KV6 tubes. All the resisters check ok. Could not check the two 1M resisters, i changed them. Can you buy new carbon resisters or are they all NOS? Thanks again. 238
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