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Actually the Pi output network consisting of the TUNE and LOAD capacitors and the tank coil form a bandpass filter with a fairly high Q. Pretty much all the filtering you need is already there. I still say the noise is mechanical. If it was electrical then there would be very tell tale signs of it. The HV would be arcing somewhere.

So what is all the hub-bub anyway? Even Collins had some problems with their mil-spec gear at one time or another. This sound's just like another another attempt to stir up crap between hams and CB'ers again. Of course some products are going to arrive with a problem, nobody builds 100% perfect 100% of the time. If you think they do you must be a hard to deal with consumer then. Obviously Ameritron found no electrical problem so it must be mechanical in nature and the fan is the likely culprit or the transformer laminations/mounting bolts.I even had a buddy that wanted me to find a buzz in his Henry 2K Classic amp. It turned out to be a loose meter. No big deal but annoying for sure.

<blockquote data-quote="Captain Kilowatt" data-source="post: 134146" data-attributes="member: 39">Actually the Pi output network consisting of the TUNE and LOAD capacitors and the tank coil form a bandpass filter with a fairly high Q. Pretty much all the filtering you need is already there. I still say the noise is mechanical. If it was electrical then there would be very tell tale signs of it. The HV would be arcing somewhere.&nbsp;So what is all the hub-bub anyway? Even Collins had some problems with their mil-spec gear at one time or another. This sound&#039;s just like another another attempt to stir up crap between hams and CB&#039;ers again. Of course some products are going to arrive with a problem, nobody builds 100% perfect 100% of the time. If you think they do you must be a hard to deal with consumer then. Obviously Ameritron found no electrical problem so it must be mechanical in nature and the fan is the likely culprit or the transformer laminations/mounting bolts.I even had a buddy that wanted me to find a buzz in his Henry 2K Classic amp. It turned out to be a loose meter. No big deal but annoying for sure.</blockquote>

[QUOTE="Captain Kilowatt, post: 134146, member: 39"] Actually the Pi output network consisting of the TUNE and LOAD capacitors and the tank coil form a bandpass filter with a fairly high Q. Pretty much all the filtering you need is already there. I still say the noise is mechanical. If it was electrical then there would be very tell tale signs of it. The HV would be arcing somewhere. So what is all the hub-bub anyway? Even Collins had some problems with their mil-spec gear at one time or another. This sound's just like another another attempt to stir up crap between hams and CB'ers again. Of course some products are going to arrive with a problem, nobody builds 100% perfect 100% of the time. If you think they do you must be a hard to deal with consumer then. Obviously Ameritron found no electrical problem so it must be mechanical in nature and the fan is the likely culprit or the transformer laminations/mounting bolts.I even had a buddy that wanted me to find a buzz in his Henry 2K Classic amp. It turned out to be a loose meter. No big deal but annoying for sure. [/QUOTE]

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