While I appreciate all the deep comments about K3 audio, I do need to report that transformers are an effective way to eliminate hum in a less-than-ideal installation. I have used cheap Radio Shack audio transformers for years to allow my transceivers of all stripes to operate on PSK31 and other computer modes. I APPRECIATE THEIR PRESENCE IN THE K3! I was able to fire up and operate PSK31, SSTV, RTTY with only a couple of cable connections. This is nice. I obviously am a dilettante operator, not a contester.
Since my antenna is way suboptimal, I do not worry about a few db in the audio chain.
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