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Re: [Amps] 3CX3000A7 on 144 MHz

Subject: Re: [Amps] 3CX3000A7 on 144 MHz
From: Jim Brown <>
Date: Fri, 7 Feb 2020 16:05:05 -0800
List-post: <>
On 2/7/2020 3:54 PM, Jim Garland wrote:
One might mention that the switcher needs to have a floating 7.5V output, so it 
doesn't provide a ground reference for the filaments.

Yes. BUT -- given that switchers are notorious for RF noise, I'd be seriously cautious about selection of one that's quiet. We all know it's POSSIBLE to build quiet ones -- the ones that Elecraft and Expert are using with their amps seem to be pretty quiet.

73, Jim K9YC

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