[Elecraft] KPA500 does not use "EBS", and doesn't have any associated bias noise

[Jim's Desktop]

  I'll add to this in that I just tested my KPA500 to see what the noise 
floor did with it on or off.  On an antenna, I noticed absolutely no 
change in noise floor on any band 160-6, but just to kill the 
atmospheric noise, I connected a dummy load to the output of the KPA500. 
  Again, absolutely no change in noise floor, either by ear or visually 
on the P3 with the KPA500 in operate, standby or power off (normal and 
also completely off via back panel switch).

Jim - W0EB

------ Original Message ------
From: "Edward R Cole" <kl7uw at acsalaska.net>
To: Elecraft at mailman.qth.net
Sent: 1/8/2015 10:41:06 AM
Subject: [Elecraft] KPA500 does not use "EBS", and doesn't have any 
associated bias noise

>A side note to this topic for RF amplifiers, in general:
>
>I have not heard of this "paper crunch" noise description, before this, 
>but it's well known with VHF and up operation that one does want to 
>remove bias during receive on many amplifiers due to "white" noise 
>being generated. Perhaps this is not detected from HF amplifiers 
>because sky noise is much higher and it is not heard.